Complex sentence: They are termed "positive" because they tend to be more communicative, buoyant and sociable-broadly matching the extrovert personality, aiming for a large number of friends and to focusing on working with them rather than on their own resources.
Split into simpler sentences: They are termed "positive" because they are suppose d to be naturally more communicative, buoyant and sociable-broadly matching the extrovert personality. They typically are supposed to aim for a large number of friends and to focus on working with them rather than on their own resources.