Complex sentence: Lianzhou has a subtropical monsoon climate and is affected by the monsoon: in the winter half of year (October-March) prevailing the northeast monsoon, and in the summer half of year (April-September) prevailing the summer monsoon, mainly southwest wind.
Split into simpler sentences: Lianzhou has a subtropical monsoon climate and is affected by the monsoon. In the winter half of year (October-March), there is the prevailing the northeast monsoon, and in the summer half of year (April-September), the prevailing summer monsoon, mainly with a southwest wind.