Complex sentence: Rowbotham started out as an organiser of an Owenite commune in the Fens, where he first observed the strange phenomenon on the Bedford level that led to his theories about the earth, but following allegations of sexual misconduct he reinvented himself as a itinerant lecturer.
Split into simpler sentences: Rowbotham started out as an organiser of an Owenite commune in the Fens, where he first observed the strange phenomenon on the Bedford level that led to his theories about the earth. Following allegations of sexual misconduct he reinvented himself as a itinerant lecturer.