Complex sentence: In 1796 he went to Lisbon with his father, and in 1802 entered Harrow School, where he knew Lord Byron, with whom he had a physical disability of the leg in common, and they kept up a correspondence.
Split into simpler sentences: In 1796 he went to Lisbon with his father, and in 1802 entered Harrow School. There he knew Lord Byron, with whom he had a physical disability of the leg in common, and they later kept up a correspondence.