Add punctuation: These threephase power quality meters are a must have for any professional who wants to locate predict prevent and troubleshoot problems in power distribution systems
A: These three-phase power quality meters are a "must have" for any professional who wants to locate, predict, prevent and troubleshoot problems in power distribution systems.

Add punctuation: Her father comes from Southern Jutland and her mother is from Sisimiut
A: Her father comes from Southern Jutland and her mother is from Sisimiut.

Add punctuation: 1 Death sitting on a coffin in a churchyard
A:
1. Death sitting on a coffin in a church-yard.