Complex sentence: The serpent grew so big that he was able to surround the Earth and grasp his own tail, and as a result he earned the alternate name of the Midgard Serpent or World Serpent.
Split into simpler sentences: The serpent grew so big that he was able to surround the Earth and grasp his own tail. As a result he earned the alternate name of the Midgard Serpent or World Serpent.