Complex sentence: This causes generalized contractions of the agonist and antagonist musculature, termed a tetanic spasm, it can occur in a distinctive form called "opisthotonos" and be sufficiently severe to fracture long bones.
Split into simpler sentences: This causes generalized contractions of the agonist and antagonist musculature, termed a tetanic spasm. Tetanic spasms can occur in a distinctive form called "opisthotonos" and be sufficiently severe to fracture long bones.