Complex sentence: Rivington Hall and Hall Barn were used as bases for troops and the Ministry of Food in World War II. After the war Rivington Hall was derelict and was restored by William Salmon who from 1953 until his death in 1988 held a lease for the property.
Split into simpler sentences: Rivington Hall and Hall Barn were used as bases for troops and the Ministry of Food in World War II, after which Rivington Hall was left derelict. The Hall and its Barn were restored by William Salmon in 1953, who until his death in 1988 held a lease for the property.