Complex sentence: Beka's reflexes have been altered to make her reaction time faster, contributing to her already-superb piloting skills, these alterations were passed down from her father (she didn't actually have the alterations done to her DNA).
Split into simpler sentences: Beka's reflexes have been altered to make her reaction time faster, contributing to her already-superb piloting skills. These alterations were passed down from her father (she didn't actually have the alterations done to her DNA).