Complex sentence: After they escape back to the surface Ray and Winston begin arguing, but Egon realizes that they are being influenced by the slime, so they strip off their clothes; they also learn the river is flowing directly to the museum.
Split into simpler sentences: After they escape back to the surface Ray and Winston begin arguing, but Egon realizes that they are being influenced by the slime, so they strip off their clothes. They also learn the river is flowing directly to the museum.