Complex sentence: The subject of the work is Costanza Bonarelli, with whom he fell in love when her husband was working as Bernini's assistant in 1636.later Bernini discovered his brother had also been having a vigorous affair with Costanza.
Split into simpler sentences: The subject of the work is Costanza Bonarelli, with whom he fell in love when her husband was working as Bernini's assistant in 1636. Later, Bernini discovered his brother had also been having a vigorous affair with Costanza.