Complex sentence: Anine Frölich was in 1771 accepted as a student in the ballet school of the court-theater, which had been founded in Christiansborg Palace by Pierre Laurent of the Frecnh theatre troupe in 1767; it was merged with the Royal Danish Theatre in 1772.
Split into simpler sentences: Anine Frölich was accepted as a student in the ballet school of the Court-Theater in 1771. The Court-Theater had been founded in 1767 at the Christiansborg Palace by Pierre Laurent, formerly of the French theatre troupe; it was merged with the Royal Danish Theatre in 1772.