Complex sentence: Draper made his debut, on the opening game of the season, in a 2--2 draw against St. Mirren; then three weeks later, He then scored two goals on his second home appearance, a 4--2 defeat by Celtic.
Split into simpler sentences: Draper made his debut in the opening game of the season, a 2--2 draw against St. Mirren. Three weeks later, he scored his first goals for his new club, netting twice-in only his second home appearance, during a 4--2 defeat by Celtic.