Complex sentence: She could reach around 50,000 HP and up to 26 Knots run, but her usual service speed was around 22 knots, making her the third fastest ship of her time.
Split into simpler sentences: She could reach around 50,000 HP and up to 26 Knots run, however generally, her service speed was around 22 knots. She was the third fastest ship of her time.