Complex sentence: Brabham cars were designed and built by Motor Racing Developments Ltd. (MRD), which was jointly owned by Tauranac and Jack Brabham and built cars for customers in several racing series.
Split into simpler sentences: Brabham cars were designed and built by Motor Racing Developments Ltd. (MRD). MRD was jointly owned by Tauranac and Jack Brabham and built cars for customers in several racing series.