Complex sentence: It was thus likely that when the Captain attempted to level off and then to go-around, the crew failed to immediately retract the spoilers which made it all the more difficult to recover from the stall before ground impact.
Split into simpler sentences: It was thus likely that when the Captain attempted to level off and then to go-around, the crew failed to immediately retract the spoilers. That made it all the more difficult to recover from the stall before ground impact.