Complex sentence: Riemenshchneider is said to have come to Würzburg for the first time at the age of 18, his Uncle served as notary and financial advisor to the Bishop there, but he did not stay for long at that time.
Split into simpler sentences: Riemenshchneider is said to have come to Würzburg for the first time at the age of 18. His Uncle served as notary and financial advisor to the Bishop there, but he did not stay for long at that time.