Complex sentence: Niese began his career in the minors in pitching for the Gulf Coast Mets of the Gulf Coast League, where he pitched in 7 games including 5 starts while earning one win and zero losses.
Split into simpler sentences: Niese began his career in the minors in pitching for the Gulf Coast Mets of the Gulf Coast League. Where he pitched in 7 games including 5 starts while earning one win and zero losses.