Simplify the following text for a Grade 5 native English-speaking person.
Original: AllmÃ nna Idrottsklubben ( usually referred to as just AIK or Gnaget ) , currently located in Solna , north of Stockholm , is one of the largest and one of the oldest sports clubs in Scandinavia .
Simplified: AIK ( which stands for AllmÃ nna Idrottsklubben ) , is a sports club from Sweden .