Complex sentence: It boycotted Haifa because it was alleged that the university had wrongly disciplined a lecturer for supposedly supporting a student who wrote about attacks on Palestinians during the founding of the state of Israel.
Split into simpler sentences: It boycotted Haifa because it was alleged that the university had wrongly disciplined a lecturer. The action against the lecturer was supposedly for supporting a student who wrote about attacks on Palestinians during the founding of the state of Israel.