Complex sentence: Rosa Mystica, sometimes known as Mystical Rose, is the title of the Blessed Virgin Mary associated with a famed Marian apparition connected with the religious Italian visionary, Pierina Gilli.
Split into simpler sentences: Rosa Mystica, sometimes known as Mystical Rose, is the name of an apparition of the Blessed Virgin Mary. It is associated with a famed Marian apparition connected with the religious Italian visionary, Pierina Gilli.