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Hi, I hope everyone is well.

I'm unsure why the three highlighted has' have been used in the way they have been...

'It is Ayestaran, a qualified fitness coach, who is credited with the rotation policy that HAS brought criticism and silverwear for Benitez at the Mestalla Stadium and Anfield and he HAS been instrumental in the improved fitness and sports science methods the Spaniard HAS brought to Liverpool.'

Rewriting the third section, is have used correctly, as in: He has been instrumental in the improved fitness AND sports science methods that HAVE been brought to Liverpool

Thanks
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I have marked the relevant Subjects and Verbs of the passage; they must agree (i.e. singular S and singular V, or plural S and plural V). In all cases, they agree and are therefore correct:

'It is Ayestaran, a qualified fitness coach, who is credited with the rotation policy (S) that HAS (V) brought criticism and silverwear for Benitez at the Mestalla Stadium and Anfield and he (S) HAS (V) been instrumental in the improved fitness and sports science methods the Spaniard (S) HAS (V) brought to Liverpool.'

Rewriting the third section, is have used correctly, as in: He has been instrumental in the improved fitness AND sports science methods (S) that HAVE (V) been brought to Liverpool.
Comments  
Thanks for your help.

You are very kind.