Complex sentence: Henri Jean Cochet (14 December 1901--1 April 1987) was a former world No.1 tennis player, and a member of the famous "Four Musketeers" from France who dominated tennis in the late 1920s and early 1930s.
Split into simpler sentences: Henri Jean Cochet (14 December 1901--1 April 1987) was a French tennis player. Cochet was a World number 1 ranked tennis player, and a member of the famous "Four Musketeers" from France who dominated tennis in the late 1920s and early 1930s.