Complex sentence: The culture had sophisticated religious beliefs about afterlife and developed hierarchical status differences: it offers the oldest known burial evidence of an elite male (the end of the fifth millennium BC is the time that Marija Gimbutas claims the transition to male dominance began in Europe).
Split into simpler sentences: The culture had sophisticated religious beliefs about afterlife and had developed hierarchical status differences. The site offers the oldest known burial evidence of an elite male (Marija Gimbutas claims that the end of the fifth millennium BC is the time that the transition to male dominance began in Europe).