Complex sentence: The term is used in Eastern Christianity to refer to what the Western Church currently calls Sacraments and Sacramentals, terms which the Western Church has carefully defined in Canon Law.
Split into simpler sentences: The term is used in Eastern Christianity to refer to what the Western Church currently calls Sacraments and Sacramentals. The terms "Sacrament" and "Sacramental" are terms which the Western Church has carefully defined in Canon Law.