Я считаю, что он мог бы и наладить

Я считаю, что он мог бы и наладить отношения с Анной, потому что они долго жили под одной крышей, однако, он даже не пытался, считая ее раздражительной

Results (English) 1:

I believe that he could mend relations with Anna because they have long lived under the same roof, however, he did not even try, considering her irritable

Results (English) 2:

I believe that he might establish a relationship with Anna, because they lived under the same roof for a long time, however, he did not even try, believing her irritable

Results (English) 3:

i think he might have a relationship with anna, because they have long lived under the same roof, but he didn"t even try to, considering her cranky