Complex sentence: Between 1375 and 1380, Lorenzo is known to have painted a Madonna of Humility with Two Angels, which is extant and held privately, although until 1936 this panel was attributed to Jacopo di Cione.
Split into simpler sentences: Between 1375 and 1380, Lorenzo is known to have painted a "Madonna of Humility with Two Angels", which is extant and held privately. Until 1936, this panel was attributed to Jacopo di Cione.