Complex sentence: He finished in 8th position in the championship, with his best result being a 2nd place at the Turkish Grand Prix, where he was leading until overtaken on the final corner by Marco Melandri.
Split into simpler sentences: He finished in 8th position in the championship, with his best result being a 2nd place at the Turkish Grand Prix. He was leading the race until he was overtaken on the final corner by Marco Melandri.