Complex sentence: Eventually he becomes convinced that a lighthouse keeper might be his soulmate, since they would both be theoretically lonely individuals; instead he finds the lighthouse is operated by a machine, EARL (Electronic Automatic Robotic Lighthouse).
Split into simpler sentences: Eventually he becomes convinced that a lighthouse keeper might be his soulmate, since they would both be theoretically lonely individuals. Instead he finds the lighthouse is operated by a machine, (EARL, Electronic Automatic Robotic Lighthouse).