Complex sentence: Frómeta then began studying Pre-Medicine in the "Universidad de Santo Domingo" and had to abandon all musical activity during this time; but he eventually dropped out on his third year to dedicate himself fully to music.
Split into simpler sentences: Frómeta then began studying Pre-Medicine in the "Universidad de Santo Domingo" and had to abandon all musical activity during this time. However, he eventually dropped out on his third year to dedicate himself fully to music.