Complex sentence: Before her father died, she had committed he life to peaceful resolution and mediation of conflict after the release of Patrick Magee in 1999 she went on to meet him several times, appearing together on stage at a peace conference on 8th September 2011.
Split into simpler sentences: Before her father died, she had committed he life to peaceful resolution and mediation of conflict. After the release of Patrick Magee in 1999 she went on to meet him several times, appearing together on stage at a peace conference on 8th September 2011.