Complex sentence: At the flower shop, he runs into a teary-eyed 5-year-old boy, who is upset because he cannot afford to purchase roses for his mother, whom he says he hasn't seen in a year.
Split into simpler sentences: At the flower shop, he runs into a teary-eyed 5-year-old boy. The boy is upset because he cannot afford to purchase roses for his mother, whom he says he hasn't seen in a year.