This is the 3487th most frequent Korean word.
만들어서
"Made and" or "by making."
In this sentence, '만들어서' indicates the action of creating lunch, which leads to the subsequent action of sharing it.
나는 점심을 만들어서 친구와 나누었어요.
I prepared lunch and shared it with my friend.
Here, '만들어서' connects the act of making paper with the subsequent activity of doing origami.
그녀는 종이를 만들어서 종이접기를 했어요.
She made paper and then did origami.
In this case, '만들어서' links the preparation of the presentation to the action of showing it to the teacher.