Answer: Ornamental grasses are usually divided in the springtime just before or just as they begin to grow for the season, so I would not suggest doing that in mid to late summer. If the tall individual flowering stems are what broke, trim them off at the base. If the bulk of the grassy foliage bent down, you could either trim it back so it looks better, or try to prop it up. You might be able to use a bit of wire mesh fencing staked into place to broadly support it and gently brace it upright. Since this is the end of the growing season, the plant should not suffer any permanent damage. You would be trimming these parts off this winter or early next spring anyway. I'm sorry about the damage.
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