Complex sentence: His torturers lit a charcoal fire under his back and forced a hook into his skin so that he could not struggle, causing Shinto have a number of large scars from the flesh being burned and from many other abuses.
Split into simpler sentences: His torturers lit a charcoal fire under his back and forced a hook into his skin so that he could not struggle. Shin has a number of large scars from the flesh being burned and from many other abuses.