Which two of the following sentences from the speech include central ideas? 1.When my attention was first directed to this matter an investigation was made by the Bureau of Animal Industry of the Department of Agriculture.
2.The report shows that the stockyards and packing houses are not kept even reasonably clean.
3.Legislation is needed in order to prevent all possible abuses in the future.
4.This amendment will be commonly known as the "Beveridge amendment."

I think the answer is the 1st one.

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.  

why do i not wanna answer this