Complex sentence: Gounaris was a Greek Elafró singer and among the foremost Greek composers and musicians of the 1950s and 1960s, Nikos Gounaris was especially popular in the Greek community in America.
Split into simpler sentences: Gounaris was a Greek Elafró singer and among the foremost Greek composers and musicians of the 1950s and 1960s. He was especially popular in the Greek community in America.