请帮我找出这里面的从句以及谓语动词的形式
MarkTwain,whoseoriginalnamewasSamuelClemens,isanimportantfigureinAmericanliterature.Speakingofshortstoriesalone,MarkTwain’spositioninAmericanliteratureisasChekhov’sisinRussianliteratureorGuydeMaupassant’sinFrenchliterature.Eveninhisownday,MarkTwainwasseenasoneofAmerica’smostfamouswriters.
At13,MarkTwainwaslearningtobeaprinter.Eightyearslaterhebegantolearntoworkasasteamboatpilot.In1865,hewrotethestoryTheCelebratedJumpingFrogofCalaverasCountry,whichmadehimfamous.Inthefollowingyears,hetravelledwidelyasasuccessfullecturerandgatheredmaterialforhiswriting.HishumorousshortstoryTheInnocentsAbroadandhisyouthfuladventures,TheAdventuresofTomSawyer,ThePrinceandthePauperandTheAdventuresofHuckleberryFinnhelpedhimwinaworldwideaudience.Atthesametimehebecameawell-knownhumorist.
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