Complex sentence: They seated 50 each in seats designed for the Wairarapa and North Island Main Trunk passenger trains, alcove-style, around tables and bore panorama windows and were air-conditioned.
Split into simpler sentences: They seated 50 each in seats designed for the Wairarapa Line and North Island Main Trunk passenger trains. These seats were alcove-style with tables, and the carriages bore panorama windows and were air-conditioned.