The blankets were cozy and kept us warm.

Meaning: This sentence means the same thing as the first sentence. It says that the blankets were comfortable and warm, and they helped to keep the people who were using them warm.

Choice of Words: The is used to refer to a specific thing. Blankets are soft, warm coverings that we use to keep ourselves warm. Were is a verb that means to exist or to be in a particular state. Cozy means comfortable and warm. Kept means to hold or maintain something. Us refers to the people who were kept warm. Warm means not cold.