To 'complicate' matters further, his train is running late. [=his train is running late, which makes the situation even more complicated or difficult]
This 'complicates' things. [=this makes the situation more difficult]
Changing jobs now would 'complicate' her life.
(..) Whoa, I'm not asking you out. I'm asking you to show me a restaurant. I mean, I'm the only friend you have in New York. - You don't wanna complicate that. - I know. I'm not asking you out. I mean, sure, we'd have fun, roll around, - get into some erotic humiliation fantasy. - Erotic? (..)2011 Friends with Benefits