What does this long sentence mean? I am confused in the parts-
Part 1: " believing, that is, that..." and
Part 2: "in terms of good and evil, confusing human issues with matters that do not relate to us"
"Both insisted on rejecting Democritus’s naturalistic explanations in favour of trying to understand the world in finalistic terms – believing, that is, that everything that happens has a purpose, a way of thinking that would reveal itself to be very misleading for understanding the ways of nature – or, in terms of good and evil, confusing human issues with matters that do not relate to us."