Complex sentence: He was educated at Harrow, where he began his intimacy with Richard Brinsley Sheridan continued after he entered Christ Church, Oxford, where, also, he made the acquaintance of Sir William Jones, the famous Orientalist, who induced him to study Arabic.
Split into simpler sentences: He was educated at Harrow, where he began his intimacy with Richard Brinsley Sheridan, which continued after he entered Christ Church, Oxford. At Oxford he also made the acquaintance of Sir William Jones, the famous Orientalist, who induced him to study Arabic.