Complex sentence: Entering a life of prayer and charity, Yolanda went on to become the convent's prioress in 1258 and remained there until her death 25 years later in 1283.
Split into simpler sentences: Entering a life of prayer and charity, Yolanda developed in her monastic life through the years, and was eventually elected the monastery's prioress in 1258. She remained there until her death 25 years later in 1283.