Complex sentence: Cockburn left the band in late 2008 after a falling-out with Barker, following this Maurice Moynihan left the band in January 2009 to focus on his solo project Venom Elite.
Split into simpler sentences: Cockburn left the band in late 2008 after a falling-out with Barker. Following this, Maurice Moynihan left the band in January 2009 to focus on his solo project Venom Elite.