英语翻译All that I claim for the recipes offered to the reader i

英语翻译
All that I claim for the recipes offered to the reader is that they are such as are confirmed by my own experience and observation,and that they have increased my own happiness whenever I have acted in accordance with them
“they are such as are confirmed ” 怎么理解 什么叫 they are such as are...
那怎么有两个are