sentences:  The following year, Nielsen began a 16-year stint as a second violinist in the Royal Danish Orchestra under the conductor Johan Svendsen, during which he played in Giuseppe Verdi's "Falstaff" and "Otello" at their Danish premieres.In 1916, he took a post teaching at the Royal Danish Academy and continued to work there until his death.Although his symphonies, concertos and choral music are now internationally acclaimed, Nielsen's career and personal life were marked by many difficulties, often reflected in his music.