Complex sentence: While living in Santa Clarita he swam for Canyons Aquatic Club, and also competed on Hart High School's swim team in Newhall, CA before matriculating in 1999 at UC Berkeley, where he received his B.A. in English in 2010.
Split into simpler sentences: While living in Santa Clarita he swam for Canyons Aquatic Club, and also competed on Hart High School's swim team in Newhall, CA. In 1999 he matriculated at UC Berkeley, where he received his B.A. in English in 2010.