Complex sentence: His two off-speed options include his slider, typically thrown around 83 MPH and his change-up, thrown in the mid- 80s both have strikeout potential, but his command of his secondary pitches is still developing.
Split into simpler sentences: His two off-speed options include his slider, typically thrown around 83 MPH, and his change-up, thrown in the mid- 80s. Both pitches have strikeout potential, but his command of his secondary pitches is still developing.