Complex sentence: Their armour has a forcefield that evaporates most bullets and resists most types of energy weapon; this seems to be concentrated around the Dalek's midsection (where the mutant is located), as normally ineffective firepower can be concentrated on the eyestalk to blind a Dalek.
Split into simpler sentences: Their armour has a forcefield that evaporates most bullets and resists most types of energy weapon. The forcefield seems to be concentrated around the Dalek's midsection (where the mutant is located), as normally ineffective firepower can be concentrated on the eyestalk to blind a Dalek.