Complex sentence: BT also announced on his Facebook page that he was collaborating with musician Aleksander Vinter on a new track, and was composing for a new film, but the name of the film was not mentioned.
Split into simpler sentences: BT also announced on his Facebook page that he was collaborating with musician Aleksander Vinter on a new track. He is also scoring for a new film, but the name of the film was not mentioned.