The history of Bernie's wife as President of a small struggling college from 2004 to 2011 that took out a loan attempting to save itself - is well known. She took a $200,000 payment (as per her contract) to leave when the board decided to get rid of her. Nothing unusual here.
I view individuals, who have no relation to the situation, digging it up and filing legal complaints now over it as pure politics. Especially seeing the complainants are Hillary donators.
Golden parachutes to leave an entity, which Sanders rails against are always "part of the contract".