Cosimo de' Medici, a great patron of the arts, sponsoring two of Donatello's most famous works, statues of David and Judith, while supporting Brunelleschi to complete the dome of the cathedral of Santa Maria del Fiore, which is known to be "Duomo.“
There is no verb in this sentence. sponsoring is a verbing modifier and not a verb. known to be is used incorrectly. It should have been "known as".
Cosimo de' Medici, a great patron of the arts, sponsoring two of Donatello's most famous works, statues of David and Judith, while supporting Brunelleschi to complete the dome of the cathedral of Santa Maria del Fiore, which is known to be
Wrong for the aforementioned reasons
Cosimo de' Medici was a great patron of the arts, sponsoring two of Donatello's most famous works, statues of David and Judith, and supporting Brunelleschi in completing the dome of the cathedral of Santa Maria del Fiore, known as
This looks correct. sponsoring and supporting are two verbing modifiers in parallel modifying the clause "Cosimo de' Medici was a great patron of the arts". "known as" is correctly used. CorrectCosimo de' Medici, a great patron of the arts, sponsored both of Donatello's most famous works, a statue of David and a statue of Judith, so that he could support Brunelleschi when he completed the dome of the cathedral of Santa Maria del Fiore, that is known as
"so that" unnecessarily and illogically brings a cause and effect situation here. The original sentence doesn't specify any cause and effect situation. that introduces a restrictive clause and therefore comma is wrong before that.
Cosimo de' Medici, a great patron of the arts, sponsoring the most famous two Donatello works, statues of David and Judith, he supported Brunelleschi in completing the dome of the cathedral of Santa Maria del Fiore, known by
sponsoring is not a verb. "he" brings another subject in a sentence without any proper conjunction. known by is wrong idiomatically.
Cosimo de' Medici was a great patron of the arts, sponsored both of Donatello's most famous works, statues of David and Judith, and he supported Brunelleschi when he completed the dome of the cathedral of Santa Maria del Fiore, known as
Sentence implies that sponsoing and supporting should have been verbing modifier suggesting how Medici was a great patron of arts. Here, this sentence is trying to make three actions parallel to each other and even the parallelism is faulty. "was a patron.., sponsored, and he supported" are not parallel.