Add spaces: Areactionofthiskindcanbeunderstoodfromtheoperationofasimpletypeofelectrochemicalcell.

Answer: A reaction of this kind can be understood from the operation of a simple type of electrochemical cell.

Add spaces: Around1900thevalvetrombonewasstillinuse.

Answer: Around 1900 the valve trombone was still in use.

Add spaces: Otherabilitiestohelponthejob

Answer:
Other abilities to help on the job