Failed comedian Arthur Fleck encounters violent thugs while wandering the streets of Gotham City dressed as a clown. Disregarded by society, Fleck begins a slow dissent into madness as he transforms into the criminal mastermind known as the Joker.
The rest of the sentences have conjunctions like 'but' and 'because'. They're connecting two sentences together with a comma. The first one is one simple sentence with no commas or conjunctions. A conjunction is a word that connects two sentences to make a compound sentence.
