Complex sentence: The 50th anniversary of his death was celebrated on 3 June 2013 by Pope Francis who visited his tomb and prayed there for a few moments and then addressed the gathered crowd and spoke about the late pontiff.
Split into simpler sentences: The 50th anniversary of his death was celebrated on 3 June 2013 by Pope Francis who visited his tomb and prayed there for a few minutes. Francis then addressed the gathered crowd and spoke about the late pontiff.