Complex sentence: The Semples steadily grew in power to become the Steward's hereditary Baillies of Renfrewshire and their extensive land holdings, Castle Semple, constituted some areas of Lochwinnoch and its hinterland.
Split into simpler sentences: The Semples steadily grew in power to become the Steward's hereditary Baillies of Renfrewshire. Their extensive land holdings, Castle Semple, constituted some areas of Lochwinnoch and its hinterland.