Complex sentence: The 2010-11 Aviva Premiership is the 24th season of the top flight English rugby union competitions, and the first to be sponsored by insurance company Aviva.
Split into simpler sentences: The 2010-11 Aviva Premiership is the current season of the top flight English rugby union competitions. This is the 24th season of a top-flight league in England, and the first sponsored by insurance company Aviva.