I cannot find the syntax error for the life of me 

If(IsEmpty(${Children.Disenrollment Date}),((Year(Today()) - Year(${Children.Enrollment Date})) * 12 + (Month(Today()) - Month(${Children.Enrollment Date})) + If((Month(Today()) * 100 + Day(Today())) >= (Month(${Children.Enrollment Date}) * 100 + Day(${Children.Enrollment Date})), 0, -1)),((Year(${Children.Disenrollment Date}) - Year(${Children.Enrollment Date})) * 12 + (Month(${Children.Disenrollment Date}) - Month(${Children.Enrollment Date})) + If((Month(${Children.Disenrollment Date}) * 100 + Day(${Children.Disenrollment Date})) >= (Month(${Children.Enrollment Date}) * 100 + Day(${Children.Enrollment Date})), 0, -1)))