Two related independent clauses can be joined by a

                                   Conjunctive Adverb

Explanation:

they have to be followed by a comma, to transition the thoughts.

In different words, they are used to connect a pair of concepts into one full sentence.

Independent Clauses unit of measurement already a pair of full concepts, so as that they'll not be combined with a comma.

They may already build a pair of full sentences

Adverbs or words that add relevant details to an inspiration.

They modify or add meanings to the actions terribly} very sentence.

So, when you have got to be compelled to be a district of two freelance clauses using a conjunctive adverb you will be ready to combine and transition the two.

there are many stores that have sales right before christmas