Proofreading Exercise

'The reason is because upstairs bars are relatively more concealed than those on the street.'


Correction: 

1. The reason is upstairs bars are relatively more concealed than those on the street.
2. It is because upstairs bars are relatively more concealed than those on the street.

Explanation:
The word 'because' is unnecessary. (http://www.masteringgrammar.com/2011/09/reason-is.html)