Complex sentence: Early AA gained the disease language and concept of the need to surrender ones will to a higher power from the Oxford Group; however AA expanded on alcoholism as a physical problem as well as a lack of spirituality.
Split into simpler sentences: Early AA gained the "disease" language and the concept of the need to surrender one's will to a higher power from the Oxford Group. However, AA expanded on alcoholism as a physical problem as well as a lack of spirituality.