Complex sentence: The film documents the troupe's history from its origins in the late 1950s within Moral Re-Armament and the Sing-Out groups, through its successful years of the 1980s and subsequent decline.
Split into simpler sentences: The film documents the troupe's history from its origins within Moral Re-Armament and the Sing-Out groups. It covers the evolution of the organization from its very beginnings in the late 1950s throughout its successful years of the 1980s and subsequent decline.