Complex sentence: Peter Duchin (b.1937), was the product of his first marriage (to Marjorie Oelrichs) and 14 years old when his father died, but the boy began a musical education with his father and eventually studied formally at Yale.
Split into simpler sentences: Peter Duchin (b.1937), was the product of his first marriage (to Marjorie Oelrichs). Though just 14 years old when his father died, the boy had begun a musical education with his father and eventually later studied formally at Yale.