We are currently working on this with DD1 (3.5, 12 month delay, verbal dyspraxia). One thing we made with the help of our speechie is a game which is 3 different coloured cards to describe a photo - who (pink), action (yellow), item (green). So there might be a photo of Grandma driving a car so she has to collect the elements to describe that; the pink picture of Grandma, the yellow picture of driving and the green picture of a car then put it in the right order. Then she can practise, she has her senteces simplified to just "Grandma driving car" currently.

Not sure if this would help in your situation as my DD1 has no comprehension issues only impaired verbal ability but DD1 enjoys it as it is all photos of people she knows and she helped us make them too.

ETA: DD1's issue is trying to articulate different sounds together so that is why she has problems with sentences, she cannot flow from one mouth movement to the next, she actually uses sentences whilst signing (I want drink please etc) but thought I'd still offer the suggestion.