Question

I completed my homework.I sat to watch a football match on TV.Joining​

Answer 1

Answer:

I sat to watch a football match on t.v. when I completed my homework

Answer 2

Answer: After completing my homework I sat to watch a football match on T.V

Or

I sat to watch a football match on T.V when I completed my homework

Or

I completed my homework and sat to watch a football match on T.V

Explanation: the first one is joined into simple sentence and the second one is joined into complex sentence and the third one is compound