Original: But because H. heidelbergensis had a larger brain-case -- with a typical cranial volume of 1100 -- 1400 cm overlapping the 1350 cm average of modern humans -- and had more advanced tools and behavior , it has been given a separate species classification .
Simplified: Homo heidelbergensis had a much larger brain ( 1.100 cm3 to 1.400 cm3 ; modern Humans have about 1.350 cm3 ) and more advanced tools .