Complex sentence: He started on the task in Antwerp in 1562, completing it 10 years later; however, the tomb was not in place in Uppsala until the early 1580s, and the finishing work lasted until 1591.
Split into simpler sentences: He started on the task in Antwerp in 1562, completing it 10 years later. Hower, the tomb was not in place in Uppsala until the early 1580s, and the finishing work lasted until 1591.