Add punctuation: Ehrenfest returned to St Petersburg saddened that Poincar s paper had been published before he could point out his own contribution to him he was paying the price for being isolated from mainstream research in St Petersburg
A: Ehrenfest returned to St Petersburg saddened that Poincare 's paper had been published before he could point out his own contribution to him -- he was paying the price for being isolated from mainstream research in St Petersburg.

Add punctuation: You will also lose your extra water weight and notice you do not experience constipation any longer
A: You will also lose your extra water weight and notice you do not experience constipation any longer.

Add punctuation: We are happy to announce that this year the exhibition of selected publications within the Award for Best Picture Book PhotoEspaa 2014 will be held at the headquarters of the National Library between the 4 June and 28 July 2014
A:
We are happy to announce that this year the exhibition of selected publications within the Award for Best Picture Book PhotoEspana 2014 will be held at the headquarters of the National Library between the 4 June and 28 July 2014.