IEnumerable<Department> departments = context
    .Departments.Where(department => department.Employees.Count > 5)
    .OrderBy(department => department.Employees.Count);
foreach (Department department in departments)
{
    content.AppendLine($"{department.Name} {department.Employee.FirstName}");
    foreach (Employee employee in department.Employees)
    {
        content.AppendLine($"{employee.FirstName} {employee.LastName} {employee.JobTitle}");
    }
}