Okay kiddo, imagine that there are some very important people in a big country called Italy. These people work for the government and they are in charge of keeping the country safe and happy. One of these important people is named Nicola; he works for the secret service and his job is to protect the country from bad guys.
Now, imagine that there is another person named Giuseppe. Giuseppe also works for the government, but he works for a company called Telecom Italia. They help people use telephones and the internet.
One day, Nicola and Giuseppe became friends. They started talking a lot on the phone and sending messages to each other. But, what they didn't know was that other people were watching them. These people were also important and they worked for other countries.
These people found out that Nicola and Giuseppe were talking about secret things that only the government should know. This was very bad because it put the safety of the whole country at risk.
So, the people who found out what Nicola and Giuseppe were doing told the government what was happening. The government was very angry and decided to arrest them both.
After they were arrested, it was found out that they were part of a group called SISMI. This group was doing bad things for a long time and it made a scandal in Italy. People were very upset that these important people were doing things that were not good.
So, the Sismi-Telecom scandal is all about two important people who did bad things by talking about secret things with each other and this made the whole country upset.