Complex sentence: Jolteon has incredibly high Speed, making it the fourth fastest Pokemon, tied with Aerodactyl, Mewtwo, and Crobat; which, coupled with its high Special Attack and Special Defense, make it a quick, powerful Pokémon.
Split into simpler sentences: Jolteon has incredibly high Speed, making it the fourth fastest Pokemon, (tied with Aerodactyl, Mewtwo, and Crobat). Coupled with its high Special Attack and Special Defense, it is a quick, powerful Pokémon.