Complex sentence: The profile and visibility of the USA Sevens has increased in the United States since NBC began broadcasting the tournament in 2011, marking the first time that the tournament had live television coverage on network TV in the United States.
Split into simpler sentences: The profile and visibility of the USA Sevens has increased since NBC began broadcasting the tournament. The 2011 USA Sevens tournament marked the first time that the tournament has had live television coverage on network TV in the United States.