Complex sentence: Money that he raised for the campaign was clearly used to finanace some of the illegal Watergate activities however Stans always maintained, and it has not been proven to the contrary, that he had no knowledge of the various Watergate crimes.
Split into simpler sentences: Money that he raised for the campaign was clearly used to finanace some of the illegal Watergate activities. However, Stans always maintained, and it has not been proven to the contrary, that he had no knowledge of the various Watergate crimes.