1. The Rhythm
2. The Pitch
Easiest way to simplify it
1 - CLAP along with the bassline, omitting different beats/notes each repeat. This'll tell you which beats are essential to the feel & which are for frills.
2 - HUM or SING the bassline. The catchiest bits are essential, and the less-clear bits can be simplified or omitted.
Ghost notes are you're friend.