A principal in the South Orange-Maplewood School District who was arrested Monday was accused of grabbing a female student by the arm and pushing her up against a wall during an altercation at a school last year, according criminal complaint released Wednesday. Frank Sanchez, principal of Columbia High School in Maplewood, surrendered to detectives from the Essex County Prosecutor’s Office Monday morning. He was charged with second-degree endangering the welfare of a child and simple assault, Essex County Chief Assistant Prosecutor Thomas Fennelly said earlier this week. According to the compl…