Complex sentence: Brabham cars were designed and built by Motor Racing Developments Ltd. (MRD), a company jointly owned by Tauranac and Jack Brabham, which 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.