Complex sentence: In 1951, the Eldorado Club Downtown was converted into Binion's Gambling Hall and Hotel while in 1954, The Showboat moved east of downtown; the following year, the Riviera opened, becoming the Strip's first high-rise.
Split into simpler sentences: In 1951, the Eldorado Club Downtown was converted into Binion's Gambling Hall and Hotel while in 1954, The Showboat moved east of downtown; the following year. The Côte d'Azur--themed The Riviera was established, becoming the ninth big hotel to open on the Strip, the Riviera opened, becoming the Strip's first high-rise.