Simplify the following text for a Grade 9 native English-speaking person.
Original: Some legions may have even been reinforced at times with units making the associated force near 15,000 â `` 16,000 or about the size of a modern division .
Simplified: Some legions may have been reinforced with units making the force near 15,000 â `` 16,000 or about the size of a modern division .