Question

She was a large woman with a large purse that had every thing in it. (split into simple sentence)

Answer 1

she was a large woman. The large purse had everything in it.
not sure that it's right but it may help you

Answer 2

Hey
here's your answer !!
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Question : She was a large woman with a large purse that had every thing in it. (split into simple sentence)

remember that simple sentences are generally joined by words like 'that' .
So in a complex sentence wherever you get a 'that' , be sure that it is a notification that it is the point where the simple sentences are being joined .

Answer :
She was a large woman with a large purse . The purse had every thing in it.
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Hope it helps !!