Read the paragraph. What is the cause for Gordon not learning how to play
chess?
Gordon wanted to learn how to play chess, so he found
a book about chess in the library. Because the rules of
chess were too complicated, Gordon could not figure out
how to play chess.
O The rules of chess were too complicated.
O Gordon checked out a book from the library.
O Gordon wanted to learn to play chess.
O The library had a book about chess.

The rules of chess were too complicated

the correct answer can either be a or b because it could be both but you should probally choose b

a complex sentence consists of an independent clause and one or more dependent clauses.  

to write complex sentences, we must use subordinating conjunctions.  

all the complex sentences begin with a subordinating conjunction and when it occurs, a comma must be place at the end of the dependent clause. on the contrary, if the sentence begins with an independent clause, then no comma is used.

after  

although  

as  

because  

before  

if  

since  

when  

for example,  

after she won the competition, she became very popular.  

although my father was hurt, he continued fighting for his rights.  

as all of you got a ten, you will be able to leave early today.  

before he went to the war, he asked his parents to bless him.  

if it is cold, i won’t go out.  

since you didn’t bring the homework, you will get low grades.  

when it is hot in the town, everyone goes to the beach.