How to say but we do know many things about his character, thanks to letters and notebooks he left behind and other people's stories about him. in Japanese
1)
しかししかし(shikashi) (n) prostitute/harlot、、(、) Japanese comma彼彼(kare) (ok) that , or something understood without naming it directly)/that person/over there/hey/eh?/thatがが(ga) (prt) indicates sentence subject/indicates possessive/but/however/still/and残したno dictionary result, likely a conjigated verbno dictionary result, likely a conjigated verb手紙手紙(tegami) (n,adj-no) letterやや(ya) (prt) such things as/and ... and/the minute .../no sooner than .../punctuational exclamation in haiku, renga, etc./interjection expressing surprise/hi/ plain copula/ yes/what?ノートノート(noto) (n,vs) notebook/copy-book/exercise book/note/notebook pc、、(、) Japanese commaそれにそれに(soreni) (conj) besides/moreover、、(、) Japanese comma人々人々(hitobito) (n,adj-no) each person/people/men/human/everybodyのの(no) (prt) indicates possessive/nominalizes verbs and adjectives/substitutes for "ga" in subordinate phrases/indicates a confident conclusion/ indicates emotional emphasis/indicates question彼彼(kare) (ok) that , or something understood without naming it directly)/that person/over there/hey/eh?/thatについてについて(nitsuite) (exp) concerning/regarding/per/for everyのの(no) (prt) indicates possessive/nominalizes verbs and adjectives/substitutes for "ga" in subordinate phrases/indicates a confident conclusion/ indicates emotional emphasis/indicates question話話(hanashi) (n) talk/speech/chat/story/conversation/discussions/negotiation/argumentのの(no) (prt) indicates possessive/nominalizes verbs and adjectives/substitutes for "ga" in subordinate phrases/indicates a confident conclusion/ indicates emotional emphasis/indicates questionおかげでおかげで(okagede) (exp) thanks to .../owing to .../because of ...、、(、) Japanese comma彼の彼の(kano) (adj-pn) that性格性格(seikaku) (n) character/personality/disposition/natureについてについて(nitsuite) (exp) concerning/regarding/per/for every多く多く(ooku) (adv) many/much/largely/abundantly/mostlyのの(no) (prt) indicates possessive/nominalizes verbs and adjectives/substitutes for "ga" in subordinate phrases/indicates a confident conclusion/ indicates emotional emphasis/indicates questionことこと(koto) (prt) particle indicating a command/particle indicating mild enthusiasm/particle indicating a gentle interrogative/particle used to soften a judgment or conclusionをを(wo) (prt) indicates direct object of action/indicates subject of causative expression/indicates an area traversed/indicates time over which action takes place/indicates point of departure or separation of action/indicates object of desire, like, hate,知ってno dictionary result, likely a conjigated verbno dictionary result, likely a conjigated verbいるいる(iru) (v1,vi) to be/to exist/to stay/ verb indicating continuing action or state。。(。) Japanese period "."
