Complex sentence: According to St. Jerome the concept of guardian angels is in the "mind of the Church" and he stated that: "how great the dignity of the soul, since each one has from his birth an angel commissioned to guard it".
Split into simpler sentences: According to St. Jerome, the concept of guardian angels is in the "mind of the Church". He stated: "how great the dignity of the soul, since each one has from his birth an angel commissioned to guard it".