Complex sentence: For some time until 2014, the cheetah was not spotted in this area, and a dispersal of cheetahs from Iran to this area is difficult, due to the fenced border between the two countries.
Split into simpler sentences: For some time, until 2014, the cheetah was not spotted here. A dispersal of cheetahs from Iran to this area is difficult, due to the fenced border between the two countries.