Complex sentence: Johann Weißheimer II was the father of the composer Wendelin Weißheimer and around the middle of the 19th Century, the most heavily taxed landowners in Rheinhessen.
Split into simpler sentences: Johann Weißheimer II was the father of the composer Wendelin Weißheimer. Around the middle of the 19th century, he was one of the most heavily taxed landowners in Rheinhessen.