Complex sentence: Rainfall, at under 1000mm is lower than one might expect for somewhere often in the main path of Atlantic depressions, this is explained by a lack of heavy convective rainfall during spring and summer months due to the absence of warm surface conditions.
Split into simpler sentences: Rainfall, at under 1000mm is lower than one might expect for somewhere often in the main path of Atlantic depressions. This is explained by a lack of heavy convective rainfall during spring and summer months due to the absence of warm surface conditions.