Complex sentence: News reports indicate that he was known to have a number of aliases, including Khalid Choudry, and was considered a "peripheral figure" by MI5 and that he was a known associate of radical individuals in Birmingham.
Split into simpler sentences: News reports indicate that he was known to have a number of aliases, including Khalid Choudry, and was considered a "peripheral figure" by MI5. He was a known associate of radical individuals in Birmingham.