IEW will have him write down three key words for each sentence, and give him ways to make the sentences more interesting(dress-ups)
I'll tell you how I'm trying to fix this with my two youngest. I have been giving them a list of questions to answer daily. For example, Where is Paris? Then they need to rephrase the question with the answer in it. Paris is in France. When they can show me that they are doing a good job rephrasing the question, I allow them to just give me the answer in a complete sentence. I will eventually have them do this in all subjects, but I wanted them to practice doing it well first so they know what is expected from them.