Transfer of XML base data to single line CSV or ODS

Client- and contract data is being exported out of an application. The data looks like example file here:

https://www.vzl24.de/cloud/index.php/s/bw4pENWRPQgqPNc

How can I change the data to get the contract data (non-bold) not below but next to the clients data (bold) in one line? The result is going to be imported in another application by CSV that can handle only “simple” data structures in one line.