Complex sentence: The American outbreak began in the New York City area (specifically, College Point, Queens) and was later seen in New Jersey and Connecticut; the virus is believed to have entered in an infected bird or mosquito, although there is no clear evidence.
Split into simpler sentences: The American outbreak began in College Point, Queens in New York City and was later speaad to the neighboring states of New Jersey and Connecticut. The virus is believed to have entered in an infected bird or mosquito, although there is no clear evidence.