Imperial,
Ive heard of Magnificent Anemones splitting in captivity, (H. malu) but I really dont know the circumstances surrounding it. You might try searching
here for answers to that question. There is a guy named Minh Nguyen who had his anemone split. He just recently lost it, but not because of the split. Might want to ask him specificaly. Let us know what you find out.
Best of luck,
Nick