Complex sentence: Towards the latter half of shooting, the appearance of her pregnancy was very apparent so the filmmakers included shooting Penélope in close up scenes while hiring Mónica to stand-in for long distance scenes as she appeared identical to her sister.
Split into simpler sentences: Towards the latter half of shooting, the appearance of her pregnancy was very apparent so the filmmakers had to figure methods of shooting around it. This included shooting Penélope in close up scenes while hiring Mónica to stand-in for long distance scenes as she appeared identical to her sister.