"All of us have bad luck and good luck. Those who persist in bad luck-those who persist in walking-are those who are there when good luck comes-and are ready to accept it. "

The backbone of this sentence you asked is: a man is a man.

Who perseveres in bad luck and who keeps moving forward are two attributive clauses that modify the subject "person".

When good luck comes, who is there and ready to accept it. This is an attributive clause guided by WHO, which modifies the object "that person". The attributive clause consists of two parts: "Is there good luck when it comes" and "Get ready to accept it".

This famous saying means that each of us has bad luck and good luck. Those who can survive bad luck and stick to it will appear when good luck comes and be ready to accept it.