Complex sentence: According to census data the number of people who do not hold religious beliefs is steadily increasing; in a 2011 survey by YouGov, 39% of people in England and Wales ticked a "No religion" box.
Split into simpler sentences: According to census data the number of people who do not hold religious beliefs is steadily increasing. In a 2011 survey by YouGov, 39% of people in England and Wales ticked a "No religion" box.