Original sentence: The focus in rational selfishness might be considered to be more self-directed (where the benefit to the group or society is a possible by-product) than the focus of enlightened self-interest which is more group-directed (and the benefit to oneself might be more of the by-product)
Edited sentence: The focus in rational selfishness might be considered to be more self-directed (where the benefit to the group or society is merely a possible by-product) than the focus of enlightened self-interest which is more group-directed (and the benefit to oneself might be more of the by-product)