Definition: Rewrite each original sentence in order to make it easier to understand by non-native speakers of English. You can do so by replacing complex words with simpler synonyms (i.e. paraphrasing), deleting unimportant information (i.e. compression), and/or splitting a long complex sentence into several simpler ones. The final simplified sentences need to be grammatical, fluent, and retain the main ideas of their original counterparts without altering their meanings.
Input: The citizens expelled it in 1552, allying with France: this was unacceptable for Charles, who sent his general Gian Giacomo Medici to lay siege to it with a Florentine-Imperial army.

The citizens removed it in 1552, allying with France: Charles didn't agree to that.  He than sent his general Gian Giacomo Medici to capture it with a Florentine-Imperial army.