Add punctuation: Reflector housing in diecasted aluminium metallised PC reflector and driver housing in polycarbonate
A: Reflector housing in die-casted aluminium, metallised PC reflector and driver housing in polycarbonate.

Add punctuation: Shellmulti strand green crystal and shell necklace
A: Shell--multi strand green crystal and shell necklace

Add punctuation: Successfully passing the CISM exam the first time will save you many hours of studying and the additional exam fees you would have to pay if you fail
A:
Successfully passing the CISM exam the first time will save you many hours of studying and the additional exam fees you would have to pay if you fail.