Complex sentence: Until 1968, the Theatres Act 1843 required scripts to be submitted for approval by the Lord Chamberlain's Office, this conflicted with the improvisational theatre techniques used by Littlewood to develop plays for performance.
Split into simpler sentences: Until 1968, the Theatres Act 1843 required scripts to be submitted for approval by the Lord Chamberlain's Office. This caused conflicts because of the improvisational theatre techniques used by Littlewood to develop plays for performance.