FANBOYS

FANBOYS is a aronym that is mostly used for simple sentences but not complex.
 F: For
A: And

N: Nor              
B: But
O: Or
Y: Yet
S: So

 It also makes your writing just a bit more interesting. You can use it for compound sentences so that means if you write a sentence and then use one of these words from FANBOYS and add another sentence. So a compound is a sentence joind togethe by one of these words.