I just reread your post and noticed the age of your babes. SO just separating them is probably not going to work, they will just climb out of bed.
So how about books on tape or you reading to them, as long as they lie still and quiet, until they are asleep. Or if they will listen to quiet music. Keep reminding them that they already played today, they can play more tomorrow, but now for sleeping.
At that age, we occasionally let them go to sleep watching tv. We just were worn out with the bedtime battles and would get comfy in the chair or couch and watch a kinda boring science show (how it's made). Then we would move them into their beds.
Another idea, get a babysitter to help you at bedtime for a couple weeks to get a new routine worked out and set up. Once kids have a routine, they will generally follow it. Some kids will fight it, but hopefully yours won't.
I also know someone who gave her kids little flashlights and if they stayed in bed they could have the lights to read books, but if they started playing, the flashlights went away.
So hopefully these are better ideas for you. If I think of more, I will pass them on to you. Try not to get too stressed, in a few months you will be on to new challenges.
Courtney wife to and mom to 4 boys: . I need !They're not typos. . . I can't spell!