Original: In 1948 the theatre was renamed the Tyl Theatre (after dramatist J.K. Tyl) and would be known as such until 1990 when, at the end of an eight year reconstruction project, it became known again as the Estates Theatre.
Simplified: In 1948 the organization became part of the National Theatre and was called Tyl Theatre (after dramatist J.K. Tyl). In 1990, after some restoration, it became known again as the Estates Theatre.