Complex sentence: Once the block has been securitized, the level of profits has now been locked in for that company, thus the risk of profit not emerging, or the benefit of super-profits, has now been passed on.
Split into simpler sentences: Once the block has been securitized, the level of profits has now been locked in for that company. As a result, the risk of profit not emerging, or the benefit of super-profits, has now been passed on.