What is the difference between complacated and complicating?
Drivers must know their directions backwards and forwards, which is a complicated/complicating task in the maze of London’s one-way streets and blocked-off pedestrian zones.

Could you explain to me so that I could understand once and forever.

Question

What is the difference between complacated and complicating?
Drivers must know their directions backwards and forwards, which is a complicated/complicating task in the maze of London’s one-way streets and blocked-off pedestrian zones.

Could you explain to me so that I could understand once and forever.

Answer

Complicated refers to something that is difficult to understand or very intricate.

Complicating means to make something more difficult or confusing.

Answer

Complicated is a participle adjective.  It looks like a past participle verb but it's an adjective.  It describes a situation or event.
Complicating is a verb. It does not belong in your example sentence.  
Use it in continuous tenses like this:  London's streets are complicating the problem.

Đừng bỏ lỡ cơ hội học ngoại ngữ ngay tại nhà. Hãy xem danh sách các gia sư ngôn ngữ giàu kinh nghiệm của chúng tôi và đăng ký buổi học đầu tiên ngay hôm nay!