Complex sentence: Twenty-four years ago, farmers Jonathan and Martha Kent missed the arrival of a Kryptonian spacecraft due to a flat tire on their truck, preventing them from discovering the infant Kal-El and raising him as their adopted son.
Split into simpler sentences: Twenty-four years ago, farmers Jonathan and Martha Kent missed the arrival of a Kryptonian spacecraft due to a flat tire on their truck. This prevented them from discovering the infant Kal-El and raising him as their adopted son.