Complex sentence: Filippo Reef is a reef that is asserted to be located in the Pacific Ocean at, 450 km east of Starbuck Island in the Line Islands, which was reported by the master of the Italian barque "Filippo" as having been seen on 28 June 1886.
Split into simpler sentences: Filippo Reef is a reef that is asserted to be in the Pacific Ocean at, east of Starbuck Island in the Line Islands. The reef was reported by the master of the Italian barque "Filippo" as having been seen on 28 June 1886.