Complex sentence: Cubillos studied at California State University, Northridge, where he was a three year letter winner in soccer from 1984-1986 and was tied for season points leader in 1985.
Split into simpler sentences: Cubillos studied at California State University, Northridge, where he was a three year letter winner in soccer from 1984 to 1986. He was tied for season points leader in 1985.