Complex sentence: Turner and colleagues Turner et al., page 440 mention a phenomenon called shamanistic initiatory crisis, a rite of passage for shamans-to-be, commonly involving physical illness and/or psychological crisis.
Split into simpler sentences: Turner and colleagues Turner et al., page 440 mention a phenomenon called shamanistic initiatory crisis. A rite of passage for shamans-to-be, commonly involving physical illness and/or psychological crisis.