Original sentence: The cars available include the Lotus 49, the Ferrari 312, the Eagle-Weslake (widely considered to be one of the most beautiful F1 cars ever built, and one of the rare US cars to have won a Grand Prix), the Brabham BT24 and the H 16 powered BRM P115 (which though striking was not a success; Jackie Stewart called it the worst F1 car he drove in his entire career)
Edited sentence: The cars available include the Lotus 49, the Ferrari 312, the Eagle-Weslake (widely considered to be one of the most beautiful F1 cars ever built, and one of the rare US cars to have won a Grand Prix), the Brabham BT24 and the astoundingly bad H 16 powered BRM P115(Sir Jackie Stewart called it the worst F1 car he drove in his entire career)