Complex sentence: As Victor becomes fascinated by Clerval's experiments, Clerval reveals his ultimate plan: to create a new race of invincible, physically perfect beings by using solar energy to animate a "second Adam" constructed from parts of corpses.
Split into simpler sentences: As Victor becomes fascinated by Clerval's experiments, Clerval reveals his ultimate plan: to create a new race of physically perfect beings by using solar energy to animate them. He intends to start by making a "second Adam" constructed from parts of corpses.