Complex sentence: The sacrament of marriage is the only sacrament that a priest does not administer directly; a priest, however, is the chief witness of the husband and wife's administration of the sacrament to each other at the wedding ceremony in a Catholic church.
Split into simpler sentences: The sacrament of marriage is the only sacrament that a priest does not administer directly. A priest, however, is the chief witness of the husband and wife's administration of the sacrament to each other at the wedding ceremony in a Catholic church.