Complex sentence: While thinking in MECE terms is a central pillar in the problem-solving approach of strategy consultancies, the term is used inappropriately because, in most situations, elements are not truly mutually exclusive, but, rather, independent.
Split into simpler sentences: While thinking in MECE terms is a central pillar of the approach of strategy consultancies, in a strict term, the term is used inappropriately. This is because, in most situations, elements are not truly mutually exclusive, but, rather, independent.