Simplify the following text for a Grade 6 native English-speaking person.
Original: Nowadays schools tend to get bigger , thus CCTV cameras enable teachers and security staff to see and then control what is happening in live . In our opinion , like Britain , we believe that our school should also install CCTV cameras .
Simplified: The exact number of CCTV cameras in the U.K. is not known for certain because there is no requirement to register CCTV cameras .