﴿ كَذَٰلِكَ ۖ وَأَوْرَثْنَٰهَا قَوْمًا ءَاخَرِينَ ﴾

“Thus it was. And [then] We made another people heirs [to what they had left],”

So it was kadhālika is the predicate of a subject that is missing such as ‘the matter was so’ and We made these an inheritance that is to say their riches for another people namely the Children of Israel.