Complex sentence: After his expulsion as a naval cadet in 1908, George Archer-Shee returned to the Roman Catholic Stonyhurst College in Lancashire, where he had been educated before going to Osborne Naval College.
Split into simpler sentences: After his expulsion as a naval cadet in 1908, Archer-Shee returned to the Roman Catholic Stonyhurst College in Lancashire. The school had been where he had been educated before going to Osborne Naval College.