Complex sentence: The boycott involved 14 Eastern Bloc countries and allies, led by the Soviet Union who initiated the boycott on May 8,1984, and was joined by others including East Germany, Czechoslovakia, Hungary and Cuba.
Split into simpler sentences: The boycott involved 14 Eastern Bloc countries and allies, led by the Soviet Union, who initiated the boycott on May 8,1984. Other countries also joined the boycott, including East Germany, Czechoslovakia, Hungary and Cuba.