A place where people go for medical treatment is on the mend.Renaissance Hospital in Groves has undergone a change in ownership and management.Last year, the state investigated complaints from a number of workers who said they weren’t paid or were paid late.In March, the hospital lost its certification to accept Medicare patients.A new management group, Foundation Surgical Hospital Affiliates based in Oklahoma City, took over Renaissance in February.The hospital now employs more than 70 people and cares for dozens of patients.