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ヤフオクをやっていると最高の友になれるであろう者がいます…
→ “There are people who, if you do Yahoo Auctions, will probably become your best friends...”
ヤフオク yahuoku = Yahoo Auctions (proper noun, brand name)
を o = object marker particle (marks the direct object of the verb)
やって yatte = do / doing (te-form of 'suru', meaning to do/make)
いる iru = to be / to exist (continuous aspect: currently in the state of doing)
と to = if / when (conditional particle introducing a condition/result clause)
最高 saikou = best / top grade (adjective/noun stem)
の no = of / possessive particle (connects nouns, here indicating 'friend OF')
友 tomodachi = friend (noun)
に ni = to / towards (particle indicating direction or target of change)
なれる nareru = can become / able to turn into (potential form of 'naru')
なる naru = to become
る ru = potential suffix marker
であろう dearou = probably / presumably (modal expression of probability/possibility)
者 mono = person / someone / entity (noun referring to a human)
が ga = subject marker particle (marks the subject of the sentence)
います imasu = there is / there are (polite present tense of 'iru' for animate beings)
