Simplify the following text for a Grade 5 native English-speaking person.
Original: This limit usually lies about 1200 m above the sea on the north side of the Alps , but on the southern slopes it often rises to 1500 m , sometimes even to 1700 m.
Simplified: This limit normally lies about 1200 m above the sea on the north side of the Alps . On the southern slopes , it often reaches to 1500 m , sometimes even to 1700 m.