Complex sentence: He had previously played several times with the Gioeli brothers in the band Brunette, replacing their regular drummer Derek; they met via Rock's former Vinnie Vincent Invasion bandmate Dana Strum, who produced one of Brunette's demos, on which Rock did some drum tracks.
Split into simpler sentences: He had previously played several times with the Gioeli brothers in the band Brunette, replacing their regular drummer. They met via Rock's former Vinnie Vincent Invasion bandmate Dana Strum, who produced one of Brunette's demos, on which Rock did some drum tracks.