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I am wondering whether this sentence is correct:

The scenes consist of about 400 images showing a non-moving ball at various locations while the rest are sequences of a moving ball.

...or if there has to be comma:

The scenes consist of about 400 images, showing a non-moving ball at various locations while the rest are sequences of a moving ball.

Since The scenes consist of about 400 images is the main clause, I would consider that a comma is needed there...but I am not sure.

EDIT: Meanwhile a colleague of mine suggested the following:

The scenes consist of about 400 images, showing a non-moving ball at various locations, while the rest are sequences of a moving ball.

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  • I won't put a comma because you are not breaking the sentence. It's quite similar to "I saw him (no comma) eating an apple along with a banana"
    – Maulik V
    Mar 23, 2016 at 9:54

1 Answer 1

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Technically you don't need a comma, though it is awfully close to being a run-on sentence without one. If you did put one in, I would actually put it before while as the clause following is independent, which means it's okay to separate the clauses with a comma. It's also likely where you would pause if you were saying the sentence aloud:

The scenes consist of about 400 images showing a non-moving ball at various locations, while the rest are sequences of a moving ball.

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