Complex sentence: The climate is a maritime climate (Cfb) with mild winters, cool summers and rainfall throughout the year with a maximum at the end of the summer and in the fall, while spring tends to be somewhat drier.
Split into simpler sentences: The climate is a maritime climate (Cfb) with mild winters and cool summers. Rain falls throughout the year, reaching its height at the end of the summer and in the autumn; spring tends to be somewhat drier.