Complex sentence: Though Denniz was initially unimpressed with the song, the tape got stuck in the cassette tape player in his car, so he listened to it over and over again, which helped him decide to help produce the track.
Split into simpler sentences: Though Denniz was initially unimpressed with the song, the tape got stuck in the cassette tape player in his car. Because of this, he was was forced to listen to it over and over again, which helped him decide to help produce the track.