Complex sentence: Soon after, Uychich's brother Brian Uychich (keyboard, vocals) began sitting in on their practices and asked to join the band, playing an old keyboard he found in the Uychich family attic.
Split into simpler sentences: Soon after, Uychich's brother Brian Uychich (keyboard, vocals) began sitting in on their practices. Brian asked to join the band, playing an old keyboard he found in the Uychich family attic.