Original sentence: However, according to Hounam's theory, because the Liberty did not sink after  two hours, the plan as quickly reversed, Israel apologised for the case of mistaken identity, and a coverup put into place.In 2003 journalist Peter Hounam wrote Operation Cyanide: How the Bombing of the USS Liberty Nearly Caused World War III, which proposes a completely different theory regarding the incident.In an attempt to explain why there was no support by US forces as backup, Hounam claims that Israel and President Johnson (USA) had secretly agreed on day four of the Six Day War that the USS Liberty would be sunk with complete loss of life.The attack would be blamed on Egypt, allowing the US in turn to attack Egypt, thus helping out Israel
Edited sentence: (This was day 4 of the Six Day War.) This would explain the lack of support by US forces as backup.As it turned out, not having sunk in two hours, the plan as quickly reversed, Israel would apologise for the case of mistaken identity, and the necessary lies and coverup put into place.Journalist Peter Hounam wrote a 2003 book, Operation Cyanide: How the Bombing of the USS Liberty Nearly Caused World War III, which thesis is that Israel and President Johnson (USA) had secretly agreed that the USS Liberty would be sunk  with complete loss of life which would then be blamed on Egypt.This would allow escalation of attacks on Egypt by the US, thus helping out Israel