Complex sentence: Many massage therapists consider themselves "Body-Workers", in that they may combine certain aspects from many of the particular fields of bodywork, into a cohesive whole, whether or not it is a vague amalgamation of ideas.
Split into simpler sentences: Many massage therapists consider themselves "Body-Workers". This is because they may combine certain aspects from many of the particular fields of bodywork, into a cohesive whole, or merely into a vague amalgamation of ideas.