Hi,
I assume all switches shown in your diagram are Layer2 switches and TRBNET server is your gateway for Corp network.
1) Configure Default gateway on TRBNET Server as 10.20.0.2 (ROUTER1 ip address).
2)
a) Login to ROUTER1 and ensure that there is a route exists for your Corp network 10.210.50.x /24 reachable via 10.20.0.99 (TRBNET server ip address). If not, please add the route.
b) Add a route to 192.168.1.0/24 via next hop 10.20.0.3
3) Login to ROUTER2 add a route to network 10.210.50.0 /24 via next hop 10.20.0.2 (ROUTER1 ip address).
If you want to manage/monitor L2 switches you need to configure default gateways on them.
For Switch 1 & Switch 2, configure 192.168.0.1 (ROUTER 1 ip address) as default gateway.
For Switch on right side, configre 192.168.1.1 (ROUTER 2 ip address) as default gateway.
Hope this helps......