Complex sentence: Whereas undesirable behavior is often assumed to be a trait of the individual, RPM states that an environment or context supportive of informational needs can foster reasonable behavior that will "bring out the best in people".
Split into simpler sentences: Whereas undesirable behavior is often assumed to be a trait of the individual, RPM states that an environment or context supportive of informational needs can foster reasonable behavior. In other words, supportive environments can "bring out the best in people".