Simplify the following text for a Grade 8 native English-speaking person.
Original: The UPC-Arena ( formerly Arnold Schwarzenegger-Stadium ) in Graz , Styria , Austria , is the home of the football clubs SK Sturm Graz and Grazer AK .
Simplified: The UPC-Arena ( formerly known as Arnold Schwarzenegger stadium ) is a footballstadium in Graz , Austria . It is the homeground of SK Sturm Graz .