Complex sentence: This ship was was laid-up in Maintenance Reserve at Rosyth with a special complement reactivated manned by Reservists for a Royal Review at Weymouth in August 1939.
Split into simpler sentences: This ship was was laid-up in Maintenance Reserve at Rosyth with a special complement. She was reactivated and manned by Reservists for a Royal Review at Weymouth in August 1939.