In many ways, the article is accurately summed up by the first line of the abstract: "An interaction between individual and contextual factors is the central theme in development of personality." What this means is that personality is the product of both nature and nuture factors, and this article goes on to suggest a few ways in which this occurs.
Genetic factors, according to the authors, "moderate" the way we respond to certain environmental, or "nurture" factors. They can even reveal, or intensify, a certain aspect of one's genetic background that may have remained hidden otherwise. To put it another way, some people may be genetically predisposed to antisocial behavior, but it may be far more likely to reveal itself if those children had been mistreated. So in terms of development, nature and nurture interact with each other throughout a person's life in very complex ways.