Complex sentence: Rubinstein is not considered to be among first rank of ballerinas, she began her training too late for that to be a possibility, she did, however, have tremendous stage presence and was able to act.
Split into simpler sentences: Rubinstein is not considered to be among first rank of ballerinas, she began her training too late for that to be a possibility. She did, however, have tremendous stage presence and was able to act.