구문 분석

Logan was among the tens of thousands of young people who overdose on fentanyl after unknowingly buying counterfeit pills or taking other drugs laced with the highly potent and addictive synthetic opioid. 
문장 쪼개기
Logan // was // among the tens of thousands of young people (who overdose on fentanyl)
after unknowingly buying counterfeit pills or taking other drugs (laced with the highly potent and addictive synthetic opioid. )
1형식 문장
Logan
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was
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among…
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who
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overdose…
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after
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unknowingly
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buying…
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(=

laced…
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)

The fentanyl trafficking supply chain is so dangerous it has created the leading cause of death in Americans ages 18 to 45. 
문장 쪼개기
The fentanyl trafficking supply chain // is // so dangerous / it // has created // the leading cause of death in Americans ages 18 to 45.
2형식 문장
The fentanyl …
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is
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so dangerous
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(that)
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it
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has formed
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the leading…
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목적어
Congressional Republicans have tied the fentanyl crisis to a surge of illegal border crossings, but Democrats say that is misinformation that conflates migrants seeking asylum with a dangerous influx of fentanyl trafficking. 
문장 쪼개기
Congressional Republicans // have tied // the fentanyl crisis to a surge of illegal border crossings,

but Democrats // say // [that // is // misinformation (= that conflates migrants (=seeking asylum with a dangerous influx of fentanyl trafficking.))]
3형식 문장 + 접속사(but) + 3형식 문장
Congressional…
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have tied
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the fen…
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but
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Democrats
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say
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[

that
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is
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misinformation
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(=

that
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conflat…
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migrants
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(=

seeking…
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))]