Complex sentence: He made his debut later that day, coming on as a substitute for Stuart Armstrong against Hearts, and scored the winner in the 81st minute, slotting in Leigh Griffiths' cross to put Celtic 2-1 ahead.
Split into simpler sentences: He made his debut later that day, coming on as a substitute for Stuart Armstrong against Hearts. He scored the winner in the 81st minute, slotting in Leigh Griffiths' cross to put Celtic 2-1 ahead.