Complex sentence: He was sent to London at a very early age to learn the craft of sculpting from his maternal uncle John Lawlor, however, on his father's insistence, he returned from London to take up an apprenticeship in the family business.
Split into simpler sentences: He was sent to London at a very early age to learn the craft of sculpting from his maternal uncle John Lawlor. However, on his father's insistence, he returned from London to take up an apprenticeship in the family business.