I have some students who struggle with making detailed sentences. So I wanted to share something that has helped my students with this. I use sentence strips, or you could also use strips of paper. I have the students write a "kindergarten sentence," but without the punctuation at the end. This is defined as a 3-4 word sentence on the sentence strip. I do tell them that as 1st and 2nd graders most of their sentences should be longer than that.
Ex. I see a cat
Next, I ask them to add a word by writing it on the strip and inserting it into the sentence by moving words as needed.
Ex. I see a black cat
Then, I invite them to add another detail to make their sentence more vivid, and to insert the words as needed.
Ex. I see a black cat sleeping under the table.
When they have added details, I have them add a punctuation mark to the end of the sentence. You could also use picture prompt with struggling students.