Complex sentence: It has been treated as a variety or subspecies of "Juniperus phoenicea"; plants occurring in the Canary Islands have been treated as a separate species, "Juniperus canariensis".
Split into simpler sentences: It has been treated as a variety or subspecies of "Juniperus phoenicea". Plants occurring in the Canary Islands have been treated as a separate species, "Juniperus canariensis".