VERB
使难以理解；使复杂化
To complicate something means to make it more difficult to understand or deal with.
例句
What complicates the issue is the burden of history...
历史的重负使问题复杂化了。
The day's events, he said, would only complicate the task of the peacekeeping forces...
他说白天发生的事件只会使维和部队的任务更为复杂。