If the Tenda Nova are in access point mode you can just wire the main node to the supplied router, so no changes needed. Even the WiFi details can still stay the same to avoid the hassle of relinking every device. Just make sure to disable the WiFi on the Linksys to avoid any congestion.
EDIT: Tenda offers a guide on how to do this:
https://www.tendacn.com/uk/faq/3123.html
Basically, the Linksys will be purely a router, while the Tenda will provide WiFi. Although, after troubleshooting a family member's Tenda kit... they're definitely going to be the bottleneck speed wise.