Setup a second Linksys router to work with the first - basic tutorial - Bridge Mode - Cascading - YouTube
Linksys Official Support - Setting the Linksys WAP300N to Wireless Bridge mode
How to Connect to Linksys Router in Bridge Mode | Router Technical Support
Linksys Official Support - Configuring the Wireless Bridge Mode on most Linksys Smart Wi-Fi Routers
Amazon.com: Linksys WRT1900AC Dual-Band+ Wi-Fi Wireless Router with Gigabit & USB 3.0 Ports and eSATA, Smart Wi-Fi Enabled to Control Your Network from Anywhere : Electronics