Complex sentence: Many Newcastle fans were incredibly angry at the perceived mistreatment of Keegan; public anger was directed at owner Mike Ashley, Executive Director Dennis Wise, vice-chairman Tony Jimenz, and Chairman Derek Llambias, who were seen to have forced Keegan out of the club.
Split into simpler sentences: Many Newcastle fans were incredibly angry at the perceived mistreatment of Keegan. In addition to owner Mike Ashley, public anger was directed at Executive Director Dennis Wise, vice-chairman Tony Jimenz and Chairman Derek Llambias, who were seen to have forced Keegan out of the club.