This is the 9457th most frequent Portuguese word.
complicar
To make complicated or difficult.
Here, 'complique' is used in the imperative mood to advise someone not to make the situation more difficult.
Não complique a situação, podemos resolvê-la.
Don't complicate the situation; we can resolve it.
In this sentence, 'complicam' is used in the indicative mood to describe how the new rules make the process more challenging.
As novas regras complicam o processo de inscrição.
The new rules complicate the registration process.
Here, 'complicou' in the past tense is used to convey how assuming more responsibilities made the work harder.