Complex sentence: According to Raymond Williams, when Swaminarayan died in 1830, the movement had a following of 1.8 million people and in 2001, the original movement had 3.5 million followers, of the total 5 million, in the Swaminarayan faith.
Split into simpler sentences: According to Raymond Williams, when Swaminarayan died in 1830, the movement had a following of 1.8 million people. In 2001, the original movement had 3.5 million of a total of 5 million followers of the Swaminarayan faith.