Correcting Sentence Structure Errors

In the following passage, one of the sentences is incorrectly structured. Choose the option that corrects the error in sentence structure:

As the sun began to set over the horizon, transforming the sky into a canvas of pinks and oranges, there was a sense of peacefulness enveloping the beach, suggesting that all who were there had temporarily forgotten their worries. The children played joyfully, while the parents watched closely and sharing amused looks. This scene, serene yet vibrantly alive, captured the fleeting essence of summer.