Complex sentence: James Milner, 9th Seigneur of Sark (?-1730) from 1723 to 1730, having bought the island from John Johnson for £5,000.
Split into simpler sentences: James Milner, 9th Seigneur of Sark (?-1730) from 1723 to 1730. He bought the island from John Johnson for £5,000.