Original sentence: He is noted for his especially masterful rendition of nessun dorma, and as possessing far more potential than he ever actualized due to a combination of poor discipline and a premature death.Indeed, he was known to reach the goals of his music instructors despite arriving for practice late and ignoring advice to protect his voice by watching what he ate and drank.Johan Jonatan  (sometimes spelled "Bjoerling" in English-language sources) (5 February 1911 – 9 September 1960) was a Swedish operatic tenor.Many prominent experts feel he had only reached around 65% of his realistic vocal potential at the time of his death, and that, had he lived longer and trained harder, he would have achieved an inestimable far higher degree of fame and skill.Though modest and soft-spoken, he was somewhat stubborn and often intemperate, and the  History of the Opera biographers have written that he was reluctant to accomodate but a few people he trusted intimately in all matter that pertained to his talent
Edited sentence: Johan Jonatan  (sometimes spelled as "Bjoerling" in English-language sources) (5 February 1911 – 9 September 1960) was a Swedish operatic tenor