Complex sentence: Ada Foster Murray, remarried on 22 February 1900, in Metuchen, New Jersey to Henry Mills Alden, managing editor of "Harper's Magazine", and Alden became Aline's step-father.
Split into simpler sentences: Ada Foster Murray, remarried on 22 February, 1900, in Metuchen, New Jersey to Henry Mills Alden. Henry was the managing editor of "Harper's Magazine", and he became Aline's step-father.