Complex sentence: The process of creating the film began with a recording session, starting 6 April 1974, at the Circus Theater in Stockholm Steene (2005:308) this provided a carefully-sung version with balanced audio, to which the singers later synchronized their mimed singing during filming.
Split into simpler sentences: The process of creating the film began with a recording session, starting 6 April 1974, at the Circus Theater in Stockholm. Anonymous (1975) This recording provided a carefully-sung version with balanced audio, to which the singers later synchronized their mimed singing during filming.