A story line is comprised of the main plot, a sequence of events involving the primary characters. There are also subplots in which the minor characters carry out their roles. The situations of the main and minor/supporting characters intertwine, thereby creating a realistic plot where people’s lives interact, just as they would in real life .
This author is making a comparison between
Explanation
The comparison is evident when the author mentions "...a realistic plot where people’s lives interact, just as they would in real life."