Complex sentence: My parents attended his funeral at the University of Leeds and later when I visited their school of chemistry as a prospective student in November 2016 my father went to collect some boat components which had been in Charles's possession.
Split into simpler sentences: My parents attended his funeral at the University of Leeds. Later, when I visited their school of chemistry (having applied to study there as an undergraduate) in November 2016 my father went to collect some boat components which had been in Charles's possession.