Complex sentence: Though just 5-foot-9 inches, Day delivered a high-octane fastball at 90--95 mph deceptively with no windup, overpowering opposing hitters with ease, and threw the competition off-balance with his pinpoint accurate curveball.
Split into simpler sentences: Though just 5-foot-9 inches, Day delivered 90--95 mph fastball. The pitch was deceptively fast because Day delivered with no windup, and threw the competition off-balance with his pinpoint accurate curveball.