Well, there are some things in German that are much easier than in English or French.
For example:
- The tenses (esp. of the past)
- The Konjunktiv, which is simpler in German than the equivalent “subjonctive” mode in Romance languages such as French.
- There is no difference between “simple” and “progressive” verb forms.
etc.
On the other hand, what is difficult in German is, for instance:
- The case system
- The problem of “trennbare Verben”
- The genders (der, die, das)
and many nuances.
Ultimately, however, it boils down to knowing (tens of) thousands of conventionalized word groups (aka “collocations”). And this isn’t a problem specific to German, but to all languages because native speakers simplify communication processes in this way. And this is also one of the reasons why statistics works so well in language usage…