Complex sentence: Islam ranks third in New York City, with official estimates ranging between 600,000 and 1,000,000 observers and including 10% of the city's public schoolchildren, followed by Hinduism, Buddhism, and a variety of other religions, as well as atheism.
Split into simpler sentences: Islam ranks third in New York City, with official estimates ranging between 600,000 and 1,000,000 observers, including 10% of the city's public school children. These three largest groups are followed by Hinduism, Buddhism, and a variety of other religions, as well as atheism.