Complex sentence: Besides his claims of technical accomplishments, Harper is known for his punk-rock hair-style and humorous lack of humility, variously subtitling himself as "pretty awesome" and "pretty much one of the coolest guys ever".
Split into simpler sentences: Besides his claims of technical accomplishments, Harper is known for his punk-rock hair-style. He has subtitled himself as "pretty awesome" and "pretty much one of the coolest guys ever".