Complex sentence: The Mach side of the kernel is responsible for the memory management, inter-process communication and the input/output system, it also allows protected memory, pre-emptive multitasking and advanced virtual memory.
Split into simpler sentences: The Mach side of the kernel is responsible for the memory management, inter-process communication and the input/output system. It also allows protected memory, pre-emptive multitasking and advanced virtual memory.