Question

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

Explanation:

A complex sentence has one independent clause and at least one dependent clause. Let's analyze each option:

• First option: Two independent clauses joined by "but" (compound sentence).
• Second option: Independent clause "We drove to the airport and picked up my cousins" and dependent clause "after their flight arrived from Toronto" (complex sentence).
• Third option: Two independent clauses joined by "and" (compound sentence).
• Fourth option: Two independent clauses joined by "but" (compound sentence).

Answer:

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