Complex sentence: On 3 May he made his debut, coming on as a 74th minute substitute in a 1--0 home win against St. Johnstone: his cross gave striker Gary Hooper the chance to fire home, but his effort was chalked off for offside.
Split into simpler sentences: On 3 May, he made his debut, coming on as a 74th minute substitute in a 1--0 home win against St. Johnstone. His cross gave striker Gary Hooper the chance to fire home but his effort was chalked off for offside.