Complex sentence: She is best known for stepping in front of King George V's horse Anmer at the Epsom Derby on 4 June 1913, sustaining injuries that resulted in her death four days later.
Split into simpler sentences: She is best known for stepping in front of King George V's horse Anmer at the Epsom Derby on 4 June 1913. She had sustaining injuries that resulted in her death four days later.