Is " he had driven 70 home runs." a proper sentence

How to combine the two sentences in bold.

Which group or words is not a phrase? a.) leaving behind the dog b.) because she smiled at me c.) smashing into a fence d.) before the first test e.) pushing the sofa

What is the independent cause in this sentence? "if the poem is about going mad when love is lost, what would happen if love didn't die? "