Complex sentence: The percentage rose to 3.1% in 2017, mainly due to recent conversions, out of 100% of people that have become Protestants, 67% were Catholic and 27% were of no religion.
Split into simpler sentences: The percentage rose to 3.1% in 2017, mainly due to recent conversions. Out of 100% of people that have become Protestants, 67% were Catholic and 27% were of no religion.