Simplify the following text for a Grade 5 native English-speaking person.
Original: R. giganticus was more than 1 metre ( 39 inches ) long and weighed about 12 â `` 14 kg ( 26 â `` 31 lb ) .
Simplified: R. giganticus was more than 1 m ( 39 in ) long and weighed about 12 -- 14 kg ( 26 -- 31 lb ) .