Complex sentence: Since Henry's death in 1997, the titles are held by his only son, Timothy Bentinck, 12th Earl of Portland, who is also Count Bentinck of the Holy Roman Empire.
Split into simpler sentences: Since Henry's death in 1997, the titles are held by his only son, Tim Bentinck, 12th Earl of Portland. Tim is also a Count Bentinck of the Holy Roman Empire.