Complex sentence: The area of Urdaibai has an Atlantic climate, wet and warm and regulated by the sea (with temperature between 9-19 degrees C.) The annual rainfall is heavy; the rainiest months are November and December, although it is distributed during all the year.
Split into simpler sentences: The area of Urdaibai has an atlantic climate, wet and warm and regulated by the sea (with temperature between 9-19 degrees). The rainfall regime is heavy, the most rainiest months are November and December, although it is distributed during all the year.