Complex sentence: He worked as a plumber in Sacramento, California for 15 months before attending UC San Diego at John Muir College, where he earned a BS in Molecular Biology with a Minor in History in 1997.
Split into simpler sentences: He worked as a plumber in Sacramento, California for 15 months before going to college. He attended school in UC San Diego at John Muir College and earned a BS in Molecular Biology, with a Minor in History in 1997.