Complex sentence: He plans to demolish the buildings from the neighborhood of Jae-Choi's restaurant and build a big mall there, but he happens to see Eun-Jin as she is being awarded for her bravery of preventing a bank robbery.
Split into simpler sentences: He plans to demolish the buildings from the neighborhood of Jae-Choi's restaurant and build a big mall in there. But he happens to see Eun-Jin as she is being awarded for her bravery of preventing a bank robbery.