Simplify the following text for a Grade 11 native English-speaking person.
Original: The Russian Orthodox Church Outside Russia ( , ' ) , also called the Russian Orthodox Church Abroad , ROCA , or ROCOR ) is a semi-autonomous part of the Russian Orthodox Church .
Simplified: The Russian Orthodox Church Outside Russia ( , ' ) , also called the Russian Orthodox Church Abroad , ROCA , or ROCOR ) is a small part of the Russian Orthodox Church .