Complex sentence: Robinson's character, his use of nonviolence and his unquestionable talent, challenged the traditional basis of segregation which then marked many other aspects of American life... he had an impact on the culture and contributed significantly to the Civil Rights Movement.
Split into simpler sentences: Robinson's character, his use of nonviolence and his unquestionable talent challenged the traditional basis of segregation which then marked many other aspects of American life. He had an impact on the culture and contributed significantly to the Civil Rights Movement.