Original sentence: In the early 2000s, upgrade design works (codename CBASS Common Broadband Advanced Sonar System) was started to improve shallow water target detection capability and counter-countermeasure capability.Unconfirmed reports indicate that the torpedoes' sensors can monitor surrounding electrical and magnetic fields
Edited sentence: In the early 2000s, upgrade design work (codename CBASS Common Broadband Advanced Sonar System) was started to improve shallow water target detection capability and counter-countermeasure capability.Unconfirmed reports indicate that the torpedo's sensors can monitor surrounding electrical and magnetic fields