You can couple sentences to one sentence. The word that couples these sentences is called "conjunction". This conjunction describes the meaning of the coupling
1: so
it is nice weather so I am going to swim
2: and
it it is raining and it is cold
3. because
I am going to swim because the weather is nice
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1: but
it is nice weather but I am not going to swim
2: or
I am going to walk or I am going to run
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If indicates a condition.
if
If the sun shines I am going to swim
If indicates the condition:
(1) if the sun shines
and if so then the conclusion is
(2) I am going to swim
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