DS1 is becoming increasingly frustrated with 'finish this story' as homework. His writing is very good, but it is very long. So he might, for example, write 4 pages which is the prologue or introduction; then another 4 pages which is the first chapter - ending on a suitable cliffhanger. But usually into the second chapter he's run out of time/energy/motivation.
Now, I know this is way too long for what he is expected to do, and his plots are way too complex.
But so far I have failed in my efforts to persuade him to produce something far shorter and simpler when required for school purposes.
He can do a short piece of writing when required; it's just stories that he can't do in a suitable concise format.
Any ideas?