Some of the english was difficult to understand wasn’t it
There was some difficult to understand English wasn’t there
わかりづらい - hard to understand, difficult to understand
わかりづらい英語 - difficult to understand English, hard to understand english
だったでしょう -wasn’t it, wasn’t there
わかりづらい英語だったでしょう
Some of the English was difficult to understand wasn’t it
There was some difficult to understand English wasn’t there
My English was probably hard to understand.
My English must have been hard to follow.
I hope my English wasn't too confusing for you.
英語では「〜しづらい・理解しにくい」を hard to understand や hard to follow(話についていきづらい)と表現します。
また「〜だったでしょう」という推測のニュアンスは probably(たぶん・きっと)や must have been 〜(〜だったに違いない)を使うとぴったり表現できます。