Complex sentence: The Scottish community of Bahá'ís numbered 421 people, 0.008%, and in the 2001 Scotland Census in the "write in" section as it was not listed as an available choice.
Split into simpler sentences: The Scottish community of Bahá'ís numbered 421 people, 0.008% of the population of Scotland, according to the 2001 Census. Respondents had to use the "write in" section as it was not listed as an available choice.