Complex sentence: Devoted to her father and his ideals, she had rejected a number of suitors, but in 1897 she fell seriously in love with Mikhail Sergeevich Sukhotin, who was in his fifties and married, with six children.
Split into simpler sentences: Devoted to her father and his ideals, she had rejected a number of suitors. In 1897, she fell in love with Mikhail Sergeevich Sukhotin, although he was in his 50s and married with six children.