How can we combine these two as they are both female words?
How do you want to combine them? please, give an example in English so we can help you
What about 'easy university and language'? Does it become 'jaami3ah wa lughah sahlah' or 'sahlatain'?
They become جامعة ولغة سهلتان jami3ahtun wa lughatun sahlatan
Grammatical gender is masculine or feminine (or neuter, in some languages), not male or female, which applies to plants and animals (including human animals).
How to differ between phrase and sentence. Like 'language is easy' or 'easy language'