Complex sentence: Sam Sumyk (born 1967 or 1968) is a French tennis coach, best known for his work with former Women's Tennis Association (WTA) world number one Victoria Azarenka, former world number two Vera Zvonareva, and 2014 Wimbledon finalist Eugenie Bouchard.
Split into simpler sentences: Sam Sumyk (born 1967 or 1968) is a French tennis coach. He is best known for his previous work with former world number one Victoria Azarenka, former world number two Vera Zvonareva, and 2014 Wimbledon finalist Eugenie Bouchard.