Complex sentence: Mary spent the subsequent months in a downward spiral, and although Rod made yet another attempt at helping her out, this failed and so he washed his hands of her and by May of that year Mary had fled Walford.
Split into simpler sentences: Mary spent the subsequent months in a downward spiral, and although Rod made yet another attempt at helping her out, this failed. He washed his hands of her and by May of that year, Mary had fled Walford.