I prefer eating in the school dinning hall. The food there is much cheaper. You don’t have to waste too much time in the line. (compound-complex sentence)

I prefer eating in the school dinning hall. The food there is much cheaper. You don’t have to waste too much time in the line. (compound-complex sentence)

I prefer eating in the school dinning hall because the food there is much cheaper, and you don’t have to waste too much time in the line.