Complex sentence: In 1855 Revd John Zeller was sent to Nablus; in 1857, after 2 years he moved to Nazareth, where he stayed for the next 20 years, then he moved to Jerusalem.
Split into simpler sentences: In 1855 Revd John Zeller was sent to Nablus. In 1857 he moved to Nazareth, where he stayed for the next 20 years, then he moved to Jerusalem.