How to connect the two networks

Hello,
I have a home based studio, with a phone jack and modem or router box. The studio has a network based on a Netgear modem router dgn3500 (192.168.0.1) to a home network based on a Livebox (192,168 .1.1) how to connect the two networks so that the machines one can send files to each other and share resources and vice versa?
I think we have already kept them in the same Workgroup but even after that it’s not communicating with each other.
Thanks for the help.
