You could rewrite it in the form of a deductive argument called a sorites where the predicate of the premise is the subject of the next premise until the conclusion of the argument joins the subject of the first premise with the predicate of the last premise.

Below is the argument rewritten in the form of a sorites:

Premise 1: In order to call on him, they need to believe.
Premise 2: In order to believe in him, they need to have heard of him
Premise 3: In order to hear of him, they need to have someone preach to them.
Premise 4: In order for someone to preach to them, you need to send that someone.
Conclusion: In order to call on him, you need to send that someone.

__________________
Curt Hayashida
member, Community Bible Church (Non-denominational)
Vallejo, CA