Question

Is these sentences are correct.

Even though I couldn’t decide which of the two sweaters to buy, the saleswoman convinced me to take both.
Since at home, I regretted the expensive purchase,I vowed to return one of the sweaters.

Answer 1

These are your instructions, right?

<i>• I couldn’t decide which of the two sweaters to buy.

• The saleswoman convinced me to take both.

• At home, I regretted the expensive purchase.

• I vowed to return one of the sweaters.
(combine the above four sentence using complex compound sentence.)</i>

You have written two sentences instead of one, and neither is a compound-complex sentence. Are you clear on the meaning of "compound-complex"?

My question is this: Do you have to combine those original 4 into 1 long sentence? Or is it OK to combine the 4 so they make up 2 sentences?

Answer 2

One correction to avoid a run-on:

<i>
Once I got home, I regretted the expensive purchase, and I vowed to return one of the sweaters.</i>