Complex sentence: Robert Kajanus and the Helsinki Philharmonic Orchestra premiered the work in Helsinki, Finland on 17 December 1918; the critics received the premiere enthusiastically and, thus, the new piece firmly established Madetoja as the vanguard of Finnish music.
Split into simpler sentences: Robert Kajanus and the Helsinki Philharmonic Orchestra premiered the work in Helsinki, Finland on 17 December 1918. The critics received the premiere enthusiastically and, thus, the new piece firmly established Madetoja as the vanguard of Finnish music.