Simplify the following text for a Grade 7 native English-speaking person.
Original: Starting at 15 f above sea level , The first 3 +3 \/ 4 m , through Barnstaple , and along the Yeo Valley stays relatively level .
Simplified: Starting at 15 f above sea level , The first 3 +3 \/ 4 m , through Barnstaple , and along the Yeo Valley stays nearly level .