The movements or techniques in Aikido are all non-complex, at least it should be. Basically, all the movements are simple.
Take any kokyu nage for example, the technique is quite simple right, but when one starts to do just the form then nothing happens.
It is not the movement itself that made the technique works. There are many principle behind it, it is then put into a physical form. The principle itself is also simple, but very hard to apply it physically, mentally, and spiritually if it gets to that.