Complex sentence: Theatres Trust has said that the internal conversions for its past usage in various guises appear to have obscured--rather than destroyed--the Trust classify the original interior work as "restorable as a theatre".
Split into simpler sentences: Theatres Trust has said that the internal conversions for its past usage in various guises appear to have obscured--rather than destroyed--the interior. The Trust classify the original interior work as "restorable as a theatre".