In 1274 and 1281, the Mongols attempted to conquer Japan, but, in both cases, the invasions were unsuccessful because of massive
typhoons. These severe weather events destroyed most of the invading ships or forced them to return home. What is the relationship between the two sentences in this excerpt?
The relationship between the two sentences in the excerpt is that the second sentece is explaining the reason why the events of the first sentece ocurred.
In the first sentence, a fact is introduced: the Mongols tried to invade Japan twice, but typhoons impeded them from doing so both times. The second sentence clarifies why: the severe weather produced by the typhoons destroyed most of the Mongol fleet, which forced them to retreat.
The way that this shows that Odysseus Is a good leader is that it forces him to make a pretty tough decision. Odysseus knows that he will need to sell very near the Scylla to avoid Charybdis. He knows that if he does, some of his men will be killed by the monster.