the Ultras Prague

Hi Ryunin,
No, I don't think it's possible to leave the "they" out.

I'd use a semicolon to separate the sentence. I think more separation than a comma is needed. I'm not sure about the last half -- does "Ultras Prague" connote some Anglophile leanings?

It would make more sense to me if it read, "Everything English was sacred to them; they called themselves the "British Boys" though they had never even been to England."

Thank you.

The Ultras Prague is probably a skinhead group or rock band, so it is not possible to change the name.

I don t undersatand about leaving the subject now.

How about sentence: He loved to play soccer, had three children, traveled a lot, married an insomniac.

Sometimes it is not necessary to use the subject? But in what cases?

look what I found in native speakers sources:

We talked to him, played his favorite music, told funny childhood
stories, and kept him as comfortable as we could........

It's a little confusing, ryunin because your sentence has "Everything English" as its subject in the first phrase. But then the subject obviously changes after the comma, and the "they" is understood. But that is not parallel structure. I think Wy is correct: it would make better sense if you changed the comma (,) to a semicolon ( and inserted the pronoun "they" to indicate change of subject.

In the example you cite in your last post the subject does not change -- it is "We" throughout, followed by a series of phrases with varying predicates. That makes the sentence quite correct.

Merry Andrew, unfortunately I figured out what you said just after posting my comment. You are right, the subject changed so it had to be mentioned.