What is the sentence of strained apart?

The phrase "strained apart" is not a complete sentence. It's a participial phrase that describes a situation or action.

To make it a sentence, you need to add a subject and a verb. Here are some examples:

* The rope strained apart under the weight.

* Their relationship strained apart after the argument.

* The fabric strained apart at the seams.

The meaning of "strained apart" is that something is being pulled or stretched to the point of breaking or separating.