Theory:

     As best I could, I explained the circumstances of those ill-omened boots. But his face and voice made so deep an impression that during the next few minutes I ordered many pairs. They lasted longer than ever. And I was not able to go to him for nearly two years.
 
     It was many months before my next visit to his shop. This time it appeared to be his elder brother, handling a piece of leather.
 
     “Well, Mr Gessler,” I said, “how are you?” He came close, and peered at me. “I am breddy well,” he said slowly “but my elder brudder is dead.”
Explanation:
 
The author felt bad about purchasing the boots from a large company. And the author tried his best to explain the scenario (which arose out of necessity) around buying those unfortunate shoes. However, the bootmaker's appearance and words had such an impact on the author that he ordered many pairs in the next few minutes. The author ordered those pairs because he felt sorry for the bootmaker. Even still, it was a good thing he ordered those boots because they lasted longer than they had ever done before.

The author's boots, as previously stated, were crafted of high-quality leather and was expertly stitched with the essence of sewing to ensure that they would endure for a long time. As a result, it took two years for the author to return to Gessler's shop.

Many months later, the author returned to the shop. Over there, he noticed one of the Gessler brothers. He was mistaken for the older Gessler sibling, who was holding a piece of leather in his hand. The author started conversing with him thinking he was the elder Gessler. But it was not Gessler's elder brother; he went close to the author and looked at him carefully as he was having trouble in recognising the author. The younger Gessler then told him that he was fine, but his elder brother was dead.
 
Meaning of difficult words:
 
S.No
Words
Meaning
1.
Ill-omenedSomething that appears to be unlucky
2.
CircumstanceA fact or occurrence that influences a situation
3.
Mistook To identify wrongly
4.
PeerTo look closely or carefully at something
Reference:
National Council of Educational Research and Training (2007). Honeycomb. Quality - John Galsworthy (pp. 71-78). Published at the Publication Division by the Secretary, National Council of Educational Research and Training, Sri Aurobindo Marg, New Delhi.