Complex sentence: A short chute (400 ft) leads to the Lefthander (turn 3, about 555 feet), so named because it's the only left on the circuit, with a chute leading to the Righthander (turn 4, about long).
Split into simpler sentences: A short chute (400 ft) leads to the Lefthander (turn 3, about 555 feet), so named because it's the only left on the circuit. Next is a chute leading to the Righthander (turn 4, about long).