Answer:
The complicating incident is that Samara realizes that there is no public place where the residents can go to relax and enjoy nature. It gives Samara something to do. It causes her to focus, and strive so that she can help her community. “Suddenly, Samara had a great idea. She decided to spend her summer campaigning for a new community park.”
Samara had found something that not only benefits the community but it benefits her too. She has now committed her summer which is the time students usually avoid work. She had decided to dedicate her summer for a greater cause. It gives her responsibility and now people are depending on her since she brought the idea. She became happy to have been part of something that would benefit Pine Grove. “Samara was happy to have been part of creating not only a beautiful space, but a common area where residents could come together."
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(Sorry I wasn't around to answer this question in 2016 but it has been answered for future reference. I suggest whoever need this answer reword this to the best of your ability I'd rather you not get in trouble for plaigarism).
Yours truly, Que.