Complex sentence: Perez went to Columbia University where he studied creative writing and played baseball for three years before being selected by the Rays in the 7th Round (195th Overall) of the 2004 MLB Draft.
Split into simpler sentences: Perez went to Columbia University where he studied creative writing and played baseball. It was three years before being selected by the Rays in the 7th Round (195th Overall) of the 2004 MLB Draft.