Complex sentence: Once in Mexico, most of the Armenian community decided to head north to the United States, but for those who stayed in the country, the majority settled in La Merced neighborhood of Mexico City where many dedicated themselves as peddlers, shoemakers and shop owners.
Split into simpler sentences: Once in Mexico, most of the Armenian community decided to head north to the United States. The majority of those who stayed in the country, settled in La Merced neighborhood of Mexico City, where many started working as peddlers, shoemakers and shop owners.