Complex sentence: Following the death of his heir apparent, Ferdinando, in 1713, Cosimo deposited a bill in the Senate, Tuscany's titular legislature, promulgating that if Cosimo and his new heir, Gian Gastone, were to predecease the Electress she would mount the throne.
Split into simpler sentences: Following the death of his heir apparent, Ferdinando, in 1713, Cosimo deposited a bill in the Senate, Tuscany's titular legislature. It promulgated that if Cosimo and his new heir, Gian Gastone, were to predecease the Electress she would mount the throne.