Complex sentence: He began as a captain at the schutterij, and it was his company was that painted in 1642 by Jacob Adriaenszoon Backer (to be seen in the Rijkmuseum Amsterdam).
Split into simpler sentences: He began as a captain at the schutterij. His company was that painted in 1642 by Jacob Adriaenszoon Backer (to be seen in the Rijkmuseum Amsterdam).