Add punctuation to the following sentence: A couple of months later he made an important visit to Paris around Christmas 1909 and there met Poincar Hadamard and Borel Prompted by discussions in Paris he began working on the problem of the invariance of dimension
A couple of months later he made an important visit to Paris, around Christmas 1909, and there met Poincare , Hadamard and Borel . Prompted by discussions in Paris, he began working on the problem of the invariance of dimension.