The veto was overridden by the senate. The senate overrode the veto. Changing the order means adding unnecessary words. The pamphlets were distributed by volunteers. Volunteers distributed the pamphlets.
Passive voice creates false formality It can make a sentence sound impersonal and stilted.
It has been shown by numerous studies that insulating your water heater saves energy. Numerous studies show insulating your water heater saves energy. The passive voice may obscure who or what is responsible for an action. It can hide the identity of the actor from your audience. It was decided that the new chicken pox vaccine was both safe and effective.