Complex sentence: The first, 40Engine, is with former vocalist Scott Reynolds; another is an instrumental band named Slorder, and he also plays bass and drums with a guitarist named Jason Crowley under the name Crowley/Egerton.
Split into simpler sentences: The first, 40Engine, is with former vocalist Scott Reynolds. Also, an instrumental band named Slorder and lastly, he is playing bass and drums with a guitarist named Jason Crowley which they have named amazingly enough, Crowley/Egerton.