Complex sentence: Hickok claimed he had killed six of the ten members of the McCanles Gang who had rushed in after using a log to batter the station door down, including two in a knife fight after he was wounded.
Split into simpler sentences: Hickok claimed he had killed six of the ten members of the McCanles Gang, who had rushed in after using a log to batter the station door down. Two of these he claimed to have killed in a knife fight after he was wounded.