Original sentence: By 1968, the PLO and Israel were committing cross border attacks against each other in violation of Lebanese sovereignty.Lebanon became the PLO's headquarters after the PLO leadership and its Fatah brigade were |expelled from Jordan]] in 1971.The Palestine Liberation Organization (PLO) recruited militants or terrorists in Lebanon from among the families of Palestinian refugees who had left Israel in 1948
Edited sentence: The Palestine Liberation Organization (PLO) was committing cross border attacks from Southern Lebanon into Israel as far back as 1968, but the area became a significant base following the arrival of the PLO leadership and its Fatah brigade after their 1971 expulsion from Jordan