Complex sentence: They concluded smaller size impedes the formation of rain clouds and the falling of light rain beneficial for agriculture; a different effect than reducing solar irradiance, but still a direct result from the presence of aerosols.
Split into simpler sentences: They concluded smaller size impedes the formation of rain clouds, and the falling of light rain is beneficial for agriculture. This was a different effect than reducing solar irradiance, but still a direct result from the presence of aerosols.