Complex sentence: Don Tulio O'Neill O'Kelly married Catherine O'Keffe y Whalen and became the parents of Arturo O'Neill O'Keffe and Tulio O'Neill O'Keffe born in St. Croix in 1784 became a General and won many distinctions during the Peninsular War.
Split into simpler sentences: Don Tulio O'Neill O'Kelly married Catherine O'Keffe y Whalen and became the parents of Arturo O'Neill O'Keffe and Tulio O'Neill O'Keffe. He became a General and won many distinctions during the Peninsular War.