Complex sentence: He lives mainly in Johannesburg on the Brenthurst Gardens estate and has a country estate in England, Waltham Place (with gardens open to the public and an associated organic Farm), at White Waltham in Berkshire.
Split into simpler sentences: He lives mainly in Johannesburg on the Brenthurst Gardens estate. He also has a country estate in England, Waltham Place (with gardens open to the public and an associated organic Farm), at White Waltham in Berkshire.