Complex sentence: After qualifying in 1968, Leibovitch did a post-fellowship at Harvard from 1970 to 1972, and in 1974 carried out a post graduate study on Immunology at the Royal Hammersmith hospital in London.
Split into simpler sentences: After qualifying in 1968, Leibowitch did a post-fellowship at Harvard from 1970 to 1972. In 1974, he carried out a post graduate study on Immunology at the Royal Hammersmith Hospital in London.