Complex sentence: Out of the 1,355 plus films mixed in SDDS, only 89 of them to date have been mixed to support the full 8 channels, mostly because most mixing studios are geared towards producing 5.1 mixes rather than 7.1 mixes.
Split into simpler sentences: Out of the 1,355 plus films mixed in SDDS, only 89 of them to date have been mixed to support the full 8 channels. Mostly because most mixing studios are geared towards producing 5.1 mixes rather than 7.1 mixes.