Incorrect sentence

Grammatically Jay it looks okay thought I might have written

During our investigation we were able to browse several pages of your domain and they were working fine

For some reason, you put a period in the middle of your sentence.

Thank you for the responses. The error has been identified and an alternative sentence was provided, but can someone please provide an EXPLANATION for this error? A particular rule that was violated perhaps. Thanks.

"Conjunctional clarifications
To find out the rationale (if any) for the ban on introductory ands (and buts, and even becauses), let’s go back to basics: what’s a conjunction and what role does it play?

A conjunction is a word such as and, but, because, while, until, although, or if.
Conjunctions are a class of word used to link sentences, clauses, phrases, or other words."

http://blog.oxforddictionaries.com/2012/01/can-i-start-a-sentence-with-a-conjunction/

I don't see any grammatical errors, Jay.

Me neither