complicate [ˈkɒmplɪkeɪt]

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vt.使复杂化，使混乱，使难懂

to make something more difficult to deal with, do or understand

There is no need to complicate matters. 没有必要使问题复杂化。
These events will greatly complicate the situation. 这些事件将使局势变得极其复杂。