Complex sentence: The dilemma is that if one hunter waits, he risks one of his fellows killing the hare for himself, sacrificing his fellows, making the risk twofold; risk the stag never come, or risk another man taking the kill.
Split into simpler sentences: The dilemma is that if one hunter waits, he risks one of his fellows killing the hare for himself, sacrificing everyone else. This makes the risk twofold; risk the stag never come, or risk another man taking the kill.