Complex sentence: One tram was converted to a welding vehicle in 1922, while the last tram was kept as a heritage tram, and is still preserved at Trondheim Tramway Museum.As traileres, the trams were renumbered 50 and 55--63.
Split into simpler sentences: One tram was converted to a welding vehicle in 1922, while the last tram was kept as a heritage tram, and is still preserved at Trondheim Tramway Museum. As trailers, the trams were renumbered 50 and 55--63.