Is combining mods possible?

Eh, no. Combining these two isn’t going to work that easy since there are skills linked in items that give + x to skill y unless the mod only adds new items and doesn’t modify existing ones.

Same for this one.

Which had the exactly same problems as described above. You could only tell it which mod is more important and therefore it would overwrite existing files by the files from the more important mod. But that also leads to trouble as some mods require registering in the same file which isn’t possible this way.

Two mastery mods for example could not be used together like this.