Complex sentence: Palm developed several versions of Palm OS for PDAs and smartphones, it was also responsible for the first versions of webOS, the first multitasking operating system for smartphones, and enyo.js a framework for html5 apps.
Split into simpler sentences: Palm developed several versions of Palm OS for PDAs and smartphones. The company was also responsible for the first versions of webOS, the first multitasking operating system for smartphones, and enyo.js a framework for html5 apps.