Complex sentence: These were run seperately from the main company as Tillingbourne (Metropolitan) which, in 1983, was sold to its management to form Metrobus, now part of the Go-Ahead Group.
Split into simpler sentences: These were run seperately from the main company as Tillingbourne (Metropolitan). In 1983 the operation was sold to its management to form Metrobus, now part of the Go-Ahead Group.