I understand what is so difficult for you.
first of all, you can make adjectives by adding な to nouns.
For example, 立派,which is a noun, plus な is 立派な.
On the other hand, you can also make verbs by adding だ or
です to nouns.
For example, 立派, which is a noun, plus だ is 立派だ。
There, now you've been able to make a verb.
けど is a conjunction, which means but or though and if you make a clause including a conjuction, you must use a verb before けど。
As the result, it becomes 立派だけど or 立派ですけど。
Sorry for my poor English! Did I make myself understood in English? he he he.