Complex sentence: The main countries of arrival for the emigrants are the U.S.A., Panama, Venezuela, Spain, and to a lesser degree also Ecuador, Brazil, Mexico, Italy, Chile, Canada, Dutch Antilles, Australia, France, Costa Rica and Israel.
Split into simpler sentences: The main countries of arrival for the emigrants are USA, Panama, Venezuela and Spain. In a lesser degree also Ecuador, Brasil, Mexico, Italia, Chile, Canada, Dutch Antilles, Australia, France, Costa Rica and Israel.