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From the book “All Hell Let Loose” by Max Hastings. The writer mentions about the condition of British farmers during WWII. Quote “farmers sent away their hunters to be trained for harness work. Many riding horses took badly to this humble duty, but Street’s Jorrocks’ trotted home like a gentleman.” unquote

T.E.D. is right here. It is mentioned that Jorrocks "trotted home". A "trot" is a type of horse gait. Therefore, Jorrocks is most likely a horse, and presumably Street was the owner of Jorrocks.

Jorrocks is actually a somewhat famous horse name (the name of a famous racing horse), so it makes sense as a horse name (though the original would have been long dead by WW2). I also note the extra apostrophe after "Jorrocks". It could be a typo.

This got to be a bit long for comments, so I'm moving the content here.

farmers sent away their hunters to be trained for harness work. Many
riding horses took badly to this humble duty, but Street’s Jorrocks
trotted home like a gentleman.

This is presumably simply a real-world example of a farmer and his horse, of the type he's talking about. In this case the farmer's surname is "Street", and the horse's name is "Jarrocks".

Most likely the author just included the names to personalize the account somewhat. Make it relatable for people who find generalized historical discussion boring. Some historical writers like to do that. I'm not one who needs or likes this writing style, but I've seen it.

Given what Wikipedia has to say about this book's writing style, you should probably expect rather a lot of this:

All Hell Let Loose covers the entire span of World War II, following
the military developments of the war but focusing on the reactions and
experiences of different individuals (both uniformed and civilian).
Reviews refer to the book as an "everyman's story" made up of accounts
from those with lesser roles in the conflict; "ranging from ship's
cooks to wireless operators, farmers and housewives to typists and
black marketeers."

The book addresses several "triumphalist" aspects of written war
history by focusing on the "misery, heroism and endurance" of
individual accounts

(emphasis mine)

I haven't read this particular book, so I can only say that I hope he pulls this off better than the authors I have read who did this. In bad cases it reads like something a history-hating editor forced the author to go back and tack in everywhere.