Complex sentence: An evacuee during World War II, Lucan returned to London after the war to attend Eton College, then from 1953 to 1955 he served with the Coldstream Guards in West Germany.
Split into simpler sentences: An evacuee during World War II, Lucan returned to London after the war. He attended Eton College, then from 1953 to 1955 he served with the Coldstream Guards in West Germany.