Simplify the following text for a Grade 2 native English-speaking person.
Original: To verify the Riemann hypothesis up to a given imaginary part T of the zeros , one also has to check that there are no further zeros off the line in this region . This can be done by calculating the total number of zeros in the region and checking that it is the same as the number of zeros found on the line .
Simplified: Many zeros have been found .