Complex sentence: Exeter Chiefs (officially Exeter Rugby Club) are an English rugby union club based in Exeter, Devon that currently play in the Aviva Premiership, the top level of domestic rugby union in England.
Split into simpler sentences: Exeter Chiefs (officially Exeter Rugby Club) are an English rugby union club based in Exeter, Devon. They are currently members of the Aviva Premiership, the top level of domestic rugby union in England.