What does president lincoln clearly state by the line in bold? there have been few examples of positive progress. there have been many examples of historical change. years ago, a terrible thing happened on this very spot. years ago, the founding fathers created the united states.
four score and seven years ago, our fathers brought forth upon this continent a new nation

you need need more details so we can understand what your asking us.

i don't see any right answer. i don't know english and only math

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.