First ad hominem attacks don't help your point. Second, Google can help you out with some of your questions. Third, "they" is Chavez and his government. Chavez was socialist, socialism implies that the government takes over production from capitalists.
How was all this inevitable? When a government doesn't like that private companies are making money, and steal their property then replace skilled managers with party cronies, maybe things aren't going to work out so well. Maybe other companies will be afraid to invest in the country. So yea, the country gets a short-term boost from acquiring billions of dollars of assets, then all the profits that used to go to the company go to the state. But then it doesn't grow or handle problems properly because no one has the same incentive to work hard and innovate.
If the price of toilet paper is high in America, there are dozens of companies that are going to compete to get that profit, supply will rise and the price will drop. In Chavez's Venezuala, the toilet paper companies get nationalized, and government bureaucrats do their best to make and distribute enough toilet paper. Or maybe they don't and just report that they are doing a good job.
Here's a short list from 2012 https://www.reuters.com/article/us-venezuela-election-nation... and you can be sure there were many companies that bent over backwards to comply with governmental demands to avoid being nationalized. It turns out the Venezuelan government, like most other governments, is not good at managing production and providing a prosperous economy without a free market. And when regulations mean a company (for example a toilet paper company) can't make a profit to create what they are selling, they can't make enough of it, and soon they won't be able to make any of it.
It's all about human nature and incentives, and yes most 5 year olds understand that.