To do A and also B, For the dual purpose of
This expression is used to indicate that the action described in the following clause is done with the two or more intentions or purposes listed in the preceding clauses. It implies doing one action to achieve multiple goals simultaneously.
This expression can also be used in the form V-(으)ㄹ 겸 (해서), but in this case it means that the speaker is choosing only one of two or more intentions to do something. This expression allows the other person to infer at the speaker has other intentions even though they are not explicitly stated.