Combine the sentences into one sentence: Mittens is a tired kitten. Mittens sleeps on the couch. Put the describing information at the beginning. It should end only with words.

Mittens, a tired kitten, sleeps on the couch.

Explanation: In this sentence, the describing information “a tired kitten” is moved to the beginning, which gives a clear picture of Mittens before stating what she does. This combines the two sentences smoothly. If you have more questions or need further assistance, feel free to ask!