Complex sentence: She invited foreign companies to play at Bollhuset, such as an Italian Opera troupe in 1652 and a Dutch theatre troupe in 1653; she was also herself an amateur-actress, and amateur-theatre was very popular at court in her days.
Split into simpler sentences: She invited foreign companies to play at Bollhuset, such as an Italian Opera troupe in 1652 and a Dutch theatre troupe in 1653. She was also herself an amateur-actress, and amateur-theatre was very popular at court in her days.