(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?