Complex sentence: However, he demonstrated little evidence of superhuman powers as a walrus is neither fast nor agile on land; his speed, agility, reflexes, and endurance seemed to be inferior to that of a normal human.
Split into simpler sentences: However, he demonstrated little evidence of superhuman powers as a walrus is neither fast nor agile on land. His speed, agility, reflexes, and endurance seemed to be inferior to that of a normal human.