Complex sentence: He was an unused substitute on one further occasion, before making his debut aged 18, from the start on 5 May 2012, he scored the only goal in a 1--0 victory over Livingston.
Split into simpler sentences: He was an unused substitute on one further occasion, before making his debut aged 18, from the start on 5 May. He scored the only goal in a 1--0 victory over Livingston.