To a first approximation(see note) all natural languages have similar complexity, it just comes out in different parts of the language. Languages with fewer moods make up for it with synonymous constructions that use more words.
(note) linguists argue about this just like they argue about everything else, but it is the safer assumption for non-linguists.
(note) linguists argue about this just like they argue about everything else, but it is the safer assumption for non-linguists.