Teddy is a teacher in that school in which/where there are many other young teachers.
Teddy is a teacher in that school,which has many other young teachers.
Teddy is one of the young teachers in the school.
Teddy is a teacher in that school in which/where there are many other young teachers.
Teddy is a teacher in that school,which has many other young teachers.
Teddy is one of the young teachers in the school.