Add punctuation: The normal cells could handle this but the cancer cells were destroyed
A: The normal cells could handle this, but the cancer cells were destroyed.

Add punctuation: Wrong Why the incorrectly identified outness which when applied does not lead to recovery
A: Wrong Why = the incorrectly identified outness which when applied does not lead to recovery.

Add punctuation: The energy class is calculated by the design programme SystemairCAD based on the actual data of the designed unit
A:
The energy class is calculated by the design programme SystemairCAD based on the actual data of the designed unit.