Complex sentence: He is very perceptive, quick witted, clever, and a skilled strategist, which goes hand in hand with his strength, is one of the major reasons of how he had survived the countless encounters that he so far had faced.
Split into simpler sentences: He is very perceptive, quick witted, clever, and a skilled strategist, which goes hand in hand with his strength. These are major reasons of why he had survived the countless encounters that he so far had faced.