Complex sentence: In both the tree and the linkage approaches, genealogical subgroups are strictly defined by their shared inheritance from a common ancestor; simply, although trees entail that all proto-languages must be discretely separated, the linkage model refuses to make that assumption.
Split into simpler sentences: In both the tree and the linkage approaches, genealogical subgroups are strictly defined by their shared inheritance from a common ancestor. Simply, although trees entail that all proto-languages must be discretely separated, the linkage model refuses to make that assumption.