Complex sentence: Elsa Wallenberg (née "Lilliehöök", 26 January 1877--17 October 1951) was a Swedish tennis player who competed in the indoor singles event at the 1908 Summer Olympics.
Split into simpler sentences: Elsa Wallenberg (26 January 1877--17 October 1951) was a Swedish female tennis player. She competed in the indoor singles event at the 1908 Summer Olympics.