Complex sentence: Margaret McLennon, formerly bursary manager of the grant, posted criticism of it on social media in August 2016, saying it was mismanaged and that she had stopped managing the grant the previous March because she hadn't been paid and movement on it had ceased.
Split into simpler sentences: Margaret McLennon, formerly bursary manager of the grant, posted criticism of it on social media in August 2016, saying it was mismanaged and that she was no longer involved. She had dropped out of the grant the previous March, because she hadn't been paid and movement on it had ceased.