Complex sentence: Genuflection to the Blessed Sacrament, especially when arriving or leaving its presence, is a practice of the Latin Rite Catholic Church only, a comparatively modern replacement for the profound bow of head and body that remains the supreme act of liturgical reverence in the East.
Split into simpler sentences: Genuflection to the Blessed Sacrament, especially when arriving or leaving its presence, has only been practiced in the Latin Rite Catholic Church. It is a comparatively modern replacement for the more profound bowing down of head and body still performed as the supreme act of liturgical reverence in the East.