Sometimes, sentences can be combined.
The leaves are green. They are shiny. They are large.
The adjectives green, shiny, and large all describe leaves. The sentences can be combined into one by using the word and. Remember to use a comma after each adjective except the last.
The leaves are green, shiny, and large.
In the example below, only a comma is needed to combine the two sentences. Both sentences describe the jacket.
The red jacket is Amelia's favorite. The jacket is warm.
The warm, red jacket is Amelia's favorite.
The warm, red jacket is Amelia's favorite.