Complex sentence: The Sugarhill Gang is an American hip hop group, known mostly for their 1979 hit "Rapper's Delight," the first rap single to become a Top 40 hit on the Billboard Hot 100.
Split into simpler sentences: The Sugarhill Gang is an American hip hop group. Their 1979 hit "Rapper's Delight" was the first rap single to become a Top 40 hit on the Billboard Hot 100.