Complex sentence: After the death of Freddie Mercury from AIDS related causes in London in 1991, the remaining members of Queen and Jim Beach their manager organized The Freddie Mercury Tribute Concert for AIDS Awareness, the profit of which was used to launch "The Mercury Phoenix Trust".
Split into simpler sentences: After the death of Freddie Mercury from AIDS related causes in London in 1991, the remaining members of Queen and Jim Beach, their manager, organized The Freddie Mercury Tribute Concert for AIDS Awareness. The profit of which was used to launch "The Mercury Phoenix Trust".