* Thousands: Adjective (modifies "years")
* of: Preposition (relates "years" to "ago")
* years: Noun (the object of the preposition "of")
* ago: Adverb (modifies "were caught")
* fish: Noun (the subject of the sentence)
* were caught: Verb (past tense of "catch")
* in: Preposition (relates "caught" to "nets" and "traps")
* nets: Noun (object of the preposition "in")
* and: Conjunction (connects "nets" and "traps")
* traps: Noun (object of the preposition "in")
Key Parts of Speech:
* Nouns: fish, years, nets, traps
* Verbs: were caught
* Adjectives: Thousands
* Adverbs: ago
* Prepositions: of, in
* Conjunction: and