What was the name of the major war during this time period? When did it start? When did it end?

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.  

not sure maybe the subject closer to it or subject-verb agreement

here is the essay.

global warming. are we heading to a mini ice age era?

everybody have heard about the effects of global warming on planet earth. but in recent studies, many scientist explain that it is not the human being and his pollutants, what is affecting the planet. that only represents a small part. they make reference that what we are living on the planet right now is one of the many cycles of planet eart through its existence. because human life is too short, we do not stay on the planet too long to see its effects.

people everywhere should be concerned, but the clarion call is for the youngster to hear it.

some russian scientist has stated that the last mini ice age era was in the 1700's and people survived. they had a brutal winter in europe. even the thames river in london, partially frozen, but humanity knew how to keep on.

that is the lesson. humanity must take consciousness and prepare for a cold future, not a warm one.