Complex sentence: Bus rapid transit (BRT, BRTS) is a bus-based mass transit system with specialized services and infrastructure designed to increase the quality and performance of the system and remove the typical causes of bus delay.
Split into simpler sentences: Bus rapid transit (BRT, BRTS) is a bus-based mass transit system. A true BRT system generally has specialized design, services and infrastructure to improve system quality and remove the typical causes of bus delay.