Complex sentence: In the early 2000s, Roc-a-Fella in-house producer Kanye West made popular the "chipmunk" technique, which had been first used by 1980s electro hip-hop group Newcleus with such songs as "Jam on It".
Split into simpler sentences: In the early 2000s, Roc-a-Fella in-house producer Kanye West made the "chipmunk" technique popular. This had been first used by 1980s electro hip-hop group Newcleus with such songs as "Jam on It".