1) Homer was a famous Greek poet.
If the underlined adjective is FAMOUS, it modifies the word POET.
2) He told the great story of the Trojan War.
If the underlined adjective is GREAT, it modifies STORY; WAR
3) Homer also recounted the fantastic adventures of Odysseus in the Odyssey.
If the underlined adjective is FANTASTIC, it modifies the word ADVENTURES.