Complex sentence: His videos, which discuss his Islamist theories, have also been circulated across the United Kingdom, and until February 2010 hundreds of audio tapes of his sermons were available at the Tower Hamlets public libraries.
Split into simpler sentences: His videos, which discuss his Islamist theories, have also been circulated across the United Kingdom. Until February 2010, hundreds of audio tapes of his sermons were available at the Tower Hamlets public libraries.