Complex sentence: His initial design efforts consisted of a angle-iron frame with wheelchair motors, batteries and gyroscopes, and he describes his very first test ride as "absolutely terrifying", resulting in a crash and a chipped kneecap.
Split into simpler sentences: His initial design efforts consisted of a angle-iron frame with wheelchair motors, batteries and gyroscopes. He describes his very first test-ride as "absolutely terrifying" and resulting in a crash and a chipped kneecap.