Complex sentence: The modern Irish-Argentine community is composed of their descendants, numbering between 300,000 and 500,000 according to estimates, making Argentina the home of the fifth largest Irish community in the world.
Split into simpler sentences: The modern Irish-Argentine community is composed of some of their descendants, and the total number ranges from 300,000 to 500,000 according to different estimates. Argentina is the home of the fifth largest Irish community in the world.