Complex sentence: He finds a fireman's hat which becomes a signature part of his character, and is then horrified to find a soldier is shivering cold in the intense summer heat, losing his hair, defecating blood, and vomiting blood.
Split into simpler sentences: He finds a fireman's hat which becomes a signature part of his character. He is later horrified to find a soldier shivering from cold in the intense summer heat, losing his hair, defecating blood, and vomiting blood.