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, who flew in 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.

the complex sentence is option c.

upon hearing the news, marianne cried tears of joy, and sean hugged his mother.

a complex sentence has one independent clause and at least one dependent clause.   an independent clause can stand alone as a sentence and do not convey a complete idea. meanwhile, dependent clauses can stand alone as a sentence.

in this case, the independent clause is "upon hearing the news."

lets g

may i see the historical information and the excerpt?