There are pretty standard ways to approach navigation when it comes to responsive layouts and, previously, responsive jQuery menu solutions were shared at WRD.

FlexNav is another jQuery plugin for easily handling menus in responsive layouts and it does that well for complex ones too.

FlexNav jQuery Plugin

The plugin has support for unlimited sub-menus that work similarly in both desktop and mobile layouts.

It has no-JS fallback, works with keyboard-tabs too (for accessibility) and touch-friendly.

WebResourcesDepot Feed