garmmar problem

but除了可以作為連接詞外，它也可以作為副詞，當作為副詞，其中之一的意思和just, only差不多

cambridge dictionary online就有一例

but adverb ( ONLY ) strong form /bʌt/ weak form /bət/ adv formal only; just She's but a young girl!

希望幫到你！

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希望可以幫到你!

Since 'it was so much better' is a clause of cause and contrast to the first statement, two conjunctions can appear simultaneously, although they look strange.

Do you mean "but because"?

"But because" is a fixed expression which means 而是因為 in Chinese.
It always comes in the form of a pattern ----- "not because...,but because...".


Hope you find it useful.

but because(但係因為)