Complex sentence: Currently, programmers almost never write programs directly in machine code, because it requires attention to numerous details that a high-level language handles automatically, requires memorizing or looking up numerical codes for every instruction, and is extremely difficult to modify.
Split into simpler sentences: Currently, programmers almost never write programs directly in machine code, because it requires attention to numerous details that a high-level language handles automatically. Furthermore it requires memorizing or looking up numerical codes for every instruction, and is extremely difficult to modify.