Complex sentence: The island was bought for £300 in 1646 by William Philipps, a barrister, and it was kept in the family for the next 360 years, until his descendant Mrs. Osra Lloyd-Philipps (1920-24 March 2005) of Dale Castle died.
Split into simpler sentences: The island was bought for £300 in 1646 by William Philipps, a barrister, and it was kept in the family for the next 360 years. In 2005 his descendant Mrs. Osra Lloyd-Philipps (1920-24 March 2005) of Dale Castle died.