From The Apple Wiki

SBSRestartRenderServerAction objects provide restarting system render server with relaunch URL when used with FBSSystemService. Available as of iOS 8.


Signature +(SBSRestartRenderServerAction *)restartActionWithTargetRelaunchURL:(NSURL *)url;
Available in 8.0 — 9.3

The method +[SBSRestartRenderServerAction restartActionWithTargetRelaunchURL:] creates SBSRestartRenderServerAction object for its further use with providing relaunch URL.

This became a stopgap that calls SBSRelaunchAction on iOS 9.3, and was removed in iOS 10.0.