Emma was excited, for she would help Granny decorate the Easter eggs.
Explanation:
A compound sentence is one that joins two independent clauses with the help of a coordinating conjunction. An independent clause can stand alone. In the sentence above, the coordinating conjunction for, joins the two independent clauses; Emma was excited, and She would help Granny decorate the Easter eggs.
'For,' in that sentence tells us the reason why Emma was excited and that is the fact that she would help Granny with the decorations.
