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(1) At the end of the fifth day, Kimberly was so tired that she only felt like going to bed, but she hashad also acknowledged that too much was expected from her performance, since Cory was expecting an evening of laughs.

(2) At the end of the fifth day, Kimberly was so tired that she only felt like going to bed, but, since Cory was expecting an evening of laughs, she hashad also acknowledged that too much was expected from her performance.

Which is better, (1), where since Cory was expecting an evening of laughs is placed at the very end, or (2), where the fragment is placed in the middle?

(1) At the end of the fifth day, Kimberly was so tired that she only felt like going to bed, but she has also acknowledged that too much was expected from her performance, since Cory was expecting an evening of laughs.

(2) At the end of the fifth day, Kimberly was so tired that she only felt like going to bed, but, since Cory was expecting an evening of laughs, she has also acknowledged that too much was expected from her performance.

Which is better, (1), where since Cory was expecting an evening of laughs is placed at the very end, or (2), where the fragment is placed in the middle?

(1) At the end of the fifth day, Kimberly was so tired that she only felt like going to bed, but she had also acknowledged that too much was expected from her performance, since Cory was expecting an evening of laughs.

(2) At the end of the fifth day, Kimberly was so tired that she only felt like going to bed, but, since Cory was expecting an evening of laughs, she had also acknowledged that too much was expected from her performance.

Which is better, (1), where since Cory was expecting an evening of laughs is placed at the very end, or (2), where the fragment is placed in the middle?

2 We're getting a lot of questions about Kitty, Jair, and Corny. To prevent appearances that we are helping the O.P. write a novel (maybe we are, but we should still try to keep questions generic), I've changed the names.
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(1) At the end of the fifth day, KittyKimberly was so tired that she only felt like going to bed, but she has also acknowledged that too much was expected from her performance, since CornyCory was expecting an evening of laughs.

(2) At the end of the fifth day, KittyKimberly was so tired that she only felt like going to bed, but, since CornyCory was expecting an evening of laughs, she has also acknowledged that too much was expected from her performance.

Which is better, (1), where since CornyCory was expecting an evening of laughs is placed at the very end, or (2), where the fragment is placed in the middle?

(1) At the end of the fifth day, Kitty was so tired that she only felt like going to bed, but she has also acknowledged that too much was expected from her performance, since Corny was expecting an evening of laughs.

(2) At the end of the fifth day, Kitty was so tired that she only felt like going to bed, but, since Corny was expecting an evening of laughs, she has also acknowledged that too much was expected from her performance.

Which is better, (1), where since Corny was expecting an evening of laughs is placed at the very end, or (2), where the fragment is placed in the middle?

(1) At the end of the fifth day, Kimberly was so tired that she only felt like going to bed, but she has also acknowledged that too much was expected from her performance, since Cory was expecting an evening of laughs.

(2) At the end of the fifth day, Kimberly was so tired that she only felt like going to bed, but, since Cory was expecting an evening of laughs, she has also acknowledged that too much was expected from her performance.

Which is better, (1), where since Cory was expecting an evening of laughs is placed at the very end, or (2), where the fragment is placed in the middle?

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Where should a subordinate sentence be placed?

(1) At the end of the fifth day, Kitty was so tired that she only felt like going to bed, but she has also acknowledged that too much was expected from her performance, since Corny was expecting an evening of laughs.

(2) At the end of the fifth day, Kitty was so tired that she only felt like going to bed, but, since Corny was expecting an evening of laughs, she has also acknowledged that too much was expected from her performance.

Which is better, (1), where since Corny was expecting an evening of laughs is placed at the very end, or (2), where the fragment is placed in the middle?