GMAT Sentence Correction (SC) | Lindane, a chemical used for both agricultural and pharmaceutical

sayantanc2k ,AbhiGarg2007 Thanks a lot for your feedback..

A correct version of this exercise should be:

Lindane, a chemical used for both agricultural and pharmaceutical purposes, effectively treats maladies such as head lice and scabies, and ithas long appeared safe to use on children, but we now know that thisbelief/fact isincorrect.

sayantanc2k ,mikemcgarry ,carcass ,AbhiGarg2007
I would really appreciate if you validate my proposal.

Thanks a a lot

Rumi