I don't know if I agree with this. It seems like the more people there are working on a project, the more likely you will end up with a complicated ball of code

I don't know if I agree with this. It seems like the more people there are working on a project, the more likely you will end up with a complicated ball of code. The reason being is people generally aren't working with the same mental model on the system they are implementing. So, some of the engineers will think its obvious to do things one way, and others will do the opposite. It doesn't make sense for complete rewrites when the other engineer reviews the code, so you end up with inconsistencies in the code. At that point there is no real way to look at the code in a coherent fashion. It doesn't completely make sense to the first or second engineer. It has become a complicated ball of code.