which is a complex sentence?\nthe director advised her clients, but they did not always follow her…

which is a complex sentence?\nthe director advised her clients, but they did not always follow her guidance.\nwe drove to the airport and picked up my cousins, after their flight arrived from toronto.\nupon hearing the news, marianne cried tears of joy, and sean hugged his mother.\nthe administration made drastic changes, but the employees ignored the new instructions.

which is a complex sentence?\nthe director advised her clients, but they did not always follow her guidance.\nwe drove to the airport and picked up my cousins, after their flight arrived from toronto.\nupon hearing the news, marianne cried tears of joy, and sean hugged his mother.\nthe administration made drastic changes, but the employees ignored the new instructions.

Answer

Brief Explanations:

A complex sentence has one independent clause and at least one dependent clause. In "We drove to the airport and picked up my cousins, after their flight arrived from Toronto", "We drove to the airport and picked up my cousins" is the independent clause and "after their flight arrived from Toronto" is the dependent clause. The other options are compound sentences with coordinating conjunctions ("but", "and") joining independent clauses.

Answer:

We drove to the airport and picked up my cousins, after their flight arrived from Toronto.