Simplify the following text for a Grade 10 native English-speaking person.
Original: Head-Smashed-In Buffalo Jump is a buffalo jump located where the foothills of the Rocky Mountains begin to rise from the prairie 18 km northwest of Fort Macleod , Alberta , Canada on highway 785 .
Simplified: Head-Smashed-In Buffalo Jump is a buffalo jump in the foothills of the Rocky Mountains about 18 km northwest of Fort Macleod , Alberta , Canada .