Complex sentence: Gallo has not asked any former RRIICCEE members to continue as part of the group since the end of their 2008 tour (last show SanDiego 2008), instead he has remained the only publicly listed member of RRIICCEE.
Split into simpler sentences: Gallo has not asked any former RRIICCEE members to continue as part of the group since the end of their 2008 tour ending in San Diego. Instead he has remained the only publicly listed member of RRIICCEE.