Usages of složen
On je napredan učenik hrvatskog i brzo razumije složene rečenice.
He is an advanced student of Croatian and quickly understands complex sentences.
Ovaj plan je složen, pa ga učiteljica polako objašnjava.
This plan is complex, so the teacher explains it slowly.
Elon.io is an online learning platform
We have an entire course teaching Croatian grammar and vocabulary.