Simplify the following text for a Grade 6 native English-speaking person.
Original: It is the smallest rhinoceros , standing about 120 - high at the shoulder , with a body length of 250 c and weight of 500 - .
Simplified: It is the smallest rhinoceros , standing about 120 â `` 145 centimetres ( 3.9 â `` 4.8 ft ) high at the shoulder , with a body length of 250 centimetres ( 98 in ) and weight of 500 â `` 800 kilograms ( 1100 â `` 1760 lb ) .