Complex sentence: The Heir Presumptive is the present holder's younger and only surviving brother the Hon. David Seymour Hicks Beach (b.1955) who is married to the former Katrina Henriques, and has issue, including one son Peter.
Split into simpler sentences: The Heir Presumptive is the present holder's younger and only surviving brother the Hon. David Seymour Hicks Beach (b.1955). He is married to the former Katrina Henriques, and has issue, including one son Peter.