Complex sentence: Mike is initially fascinated by this rather strange group of people and is in awe of their focus and technical competence on the rock, while their obvious incompetence in more mundane areas of life only seems to increase their glamour.
Split into simpler sentences: Mike is initially fascinated by this rather strange group of people and is in awe of their focus and technical competence on the rock. Their obvious "incompetence" in more mundane areas of life only seems to increase their glamour.