Complex sentence: Kratzer also collaborated with Holbein on producing maps, and in return the artist produced a portrait of Kratzer in 1528 that now hangs in the Louvre; it depicts the craftsman surrounded by the tools of his trade.
Split into simpler sentences: Kratzer also collaborated with Holbein on producing maps, and in return the artist produced a portrait of Kratzer in 1528 which now hangs in the Louvre. It depicts the craftsman surrounded by the tools of his trade.