If I had listened to your advice back then, I would not have had the success I have now.
"If I had listened to your advice back then"＝「もし私があの時、あなたのアドバイスに耳を傾けていたら」
"I would not have had the success I have now"＝「今私がある成功は無かっただろう」
Sentence in context:
"It's a good thing that I did not listen to your advice back then, because I would probably not have succeeded had I done so."
アメリカ合衆国 
