Complex sentence: The first reported sighting occurred around 6:00 Pm CST by a resident of Selden, Texas, 8 Miles SouthEast of Stephenville, who reported flashing lights that were moving in a northwesterly direction, which were followed by 2 F-16 fighter jets (4).
Split into simpler sentences: The first reported sighting occurred around 6:00 Pm CST by a resident of Selden, Texas, 8 Miles SouthEast of Stephenville. The lights were followed soon after by 2 F-16 fighter jets (4).