Complex sentence: He focused on his left leg due to a Judo-related injury to his right knee, he also suffered the loss of one testicle during a point fighting tournament, when his protective cup was struck at an unfortunate angle.
Split into simpler sentences: He focused on his left leg due to a Judo-related injury to his right knee. He also suffered the loss of one testicle during a point fighting tournament, when his protective cup was struck at an unfortunate angle.