2. A nod, gesture, or a glance can be interpreted by people in several ways.
People can interpret a nod, gesture or a glance in several ways.
The passive is not warranted here unless the author wishes to emphasize "the nod, gesture or glance."
However, there is a slight problem with this active voice sentence. The "in several ways" could be interpreted as being part of "a glance" so that what is being interpreted is "a glance in several ways."