Complex sentence: The expected rise of spirituality (ietsism) has come to a halt according to research in 2015: in 2006 40% of respondents considered themselves spiritual, in 2015 this has dropped to 31%.
Split into simpler sentences: The expected rise of spirituality (ietsism) has come to a halt according to research in 2015. In 2006 40% of respondents considered themselves spiritual, in 2015 this has dropped to 31%.