Complex sentence: Irving Berlin (born Israel Isidore Baline, May 11,1888--September 22,1989) was an American composer and lyricist, widely considered one of the greatest songwriters in American history, whose music forms a great part of the Great American Songbook.
Split into simpler sentences: Irving Berlin (born Israel Isidore Baline, May 11,1888--September 22,1989) was an American composer and lyricist, widely considered one of the greatest songwriters in American history. His music forms a great part of the Great American Songbook.