Add punctuation: A manufacturer of led tube Led T8 at zhongshan karnar lighting electron factory
A: A manufacturer of led tube Led T8 at zhongshan karnar lighting & electron factory.

Add punctuation: All positions had previously been determined by means of a remotely controlled drone MSF which towed a sidescan sonar behind it
A: All positions had previously been determined by means of a remotely controlled drone (MSF), which towed a side-scan sonar behind it.

Add punctuation: AKG signature sound The result of more than 60 years of expertise in the field working side by side with music professionals
A:
AKG signature sound The result of more than 60 years of expertise in the field, working side by side with music professionals.