A rural Amherst man will spend additional time in state prison following sentencing on a sexual assault conviction in Waupaca County Circuit Court. 30 year old Alex J. Platta entered a no contest plea to 2nd degree sexual assault of a child, and was ordered to serve 4 years in prison, along with 4 years extended supervision. The prison time was ordered to be served consecutively to a 7 year term imposed in a Portage County sexual assault conviction last December. In the Waupaca County case, Platta had ongoing sexual relations with a 15 year old girl in Waupaca in the spring of 2015. Along with the prison time, Platta was ordered to comply with the state sex offender registry, and he was ordered to pay 16-thousand dollars in restitution.