Complex sentence: Meanwhile, a spirit resembling Janosz kidnaps Oscar from Peter's apartment, and Dana pursues them to the museum alone; after she enters, the museum is covered with a barrier of impenetrable slime.
Split into simpler sentences: Meanwhile, a spirit resembling Janosz kidnaps Oscar from Peter's apartment, and Dana pursues them to the museum alone. After she enters, the museum is covered with a barrier of impenetrable slime.