Original sentence: English & Hindi are used to communicate with non malayalees, Malayalam with locals, one variant of Konkani for informal talks & the other variant (which they do not teach to anybody else) for conveying secret messages among members of the community
Edited sentence: English & Hindi are used to communicate with non malayalees, Malayalam with locals, one variant of Konkani for informal talks & the other variant (this variant they do not teach anybody else) for conveying secret messages (& this made them the best businessmen in India, and they rule) among members of the community