Complex sentence: He begs her to toss it into the sun before it explodes, she does so, but before the sun could melt it down, it exploded creating a momentary tear in the fabric of space and time.
Split into simpler sentences: He begs her to toss it into the sun before it explodes. She does so, but before the sun could melt it down, it exploded creating a momentary tear in the fabric of space and time.