Simplify the following text for a Grade 12 native English-speaking person.
Original: In subsequent years , international Test cricket has generally been organised as bilateral series : a multilateral Test tournament was not organised again until the quadrangular Asian Test Championship in 1999 .
Simplified: In subsequent years , international Test cricket has been generally been organised as bilateral series . A multi team Test tournament was not organised again until the quadrangular Asian Test Championship in 1999 .