Complex sentence: At the beginning of the 20th century, American civil government established Romblon's local government and in what is now Alcantara municipality, only 2 barrios were retained from its original 6 barrios by the end of Spanish regime.
Split into simpler sentences: At the beginning of the 20th century, American civil government established Romblon's local government. Thus, in what is now Alcantara municipality, only 2 barrios were retained from its original 6 barrios by the end of Spanish regime.