Complex sentence: NABI Bus, LLC (NABI) was a designer and producer of heavy-duty transit buses from 31-feet to 60-feet in length, which were sold to operators throughout the United States and Puerto Rico.
Split into simpler sentences: NABI Bus, LLC (NABI) was a designer and producer of heavy-duty transit buses from 31-feet to 60-feet in length. These were sold to operators throughout the United States and Puerto Rico.