Complex sentence: Meanwhile, Homer, fearing Maggie could die from touching things unsafe to her when he hears this from a baby-proofing saleswoman, starts his own baby-proofing crusade, selling cheap but safe and effective products and making Springfield safe for children.
Split into simpler sentences: Meanwhile, Homer starts to fear that Maggie could die from touching things unsafe to her when he hears this from a childproofing saleswoman. As a result, he starts his own childproofing crusade, selling cheap but safe and effective products and making Springfield safe for children.