Complex sentence: He and his younger sister Wednesday play together fairly often, sharing a devotion to dynamite, spiders, and other such entertainments; at the beginning of the series, he was eight years old, two years older than Wednesday.
Split into simpler sentences: He and his younger sister Wednesday play together fairly often, sharing a devotion to dynamite, spiders, and other such entertainments. At the beginning of the series, he was eight years old, two years older than Wednesday.