Complex sentence: From the 1960s the Hall was leased out to commercial tenants including from 1967-1972 BSA-Triumph Motorcycles (for their research & development department) and in 1978 it was converted into twelve apartments and two mews cottages.
Split into simpler sentences: From the 1960s the Hall was leased out to commercial tenants including from 1967-1972 BSA-Triumph Motorcycles (for their research & development department). In 1978 it was converted into twelve apartments and two mews cottages.