Complex sentence: Garthwaite creates a costume for himself and adopting the alias the "Wrecker", commits a series of robberies, demolishing looted locations and leaving a crowbar at the scene of the crime.
Split into simpler sentences: Garthwaite creates a costume for himself and adopting the alias the "Wrecker", commits a series of robberies. The character would also demolish looted locations and leave a crowbar at the scene of the crime.