Complex sentence: Production of the "Dolphin" was eclipsed by the advent of the "Maruti 800", to compete a five-door version of the Dolphin was developed, called the "Montana".
Split into simpler sentences: Production of the "Dolphin" was eclipsed by the advent of the "Maruti 800". To compete, a five-door version of the Dolphin was developed, called the "Montana".