Complex sentence: Sophia Schröder was a court singer, and performed for the royal court at various occasions as well as at the performances of the orchestra; from 1731, the royal orchestra also performed public concerts at "Riddarhuset" in Stockholm.
Split into simpler sentences: Sophia Schröder was a court singer, and performed for the royal court at various occasions as well as at the performances of the orchestra. From 1731, the royal orchestra also performed at public concerts at "Riddarhuset" in Stockholm.