Complex sentence: Nantgarw combined with Windsor Colliery, Abertridwr in 1974, and although the unit was profitable post the 1984/5 miners strike, closed as part of the NCB regional review in November 1986.
Split into simpler sentences: Nantgarw combined with Windsor Colliery, Abertridwr in 1974. Although profitable post the 1984/5 UK miners strike, the whole unit closed as part of the NCB regional review in November 1986.