How can I simplify this text?
"Idioms In some countries, different groups of people have their own unique dialects for a language; this is common in Arab communities in which some groups use a more formal dialect, while others do not. However, even if the different groups of people can have their own unique way of informal communication, this can be a challenge for people outside of their social group. may become difficult for an outsider Understanding informal communication within a group, unless it is explained clearly."
Idioms allow people to visualize (see) events, things or people in creative ways. They also allow groups of people to create their own special meaning. Idioms are often difficult to translate into other languages due to their non-literal meaning; for example, how does a person translate "It's raining cats and dogs?" A literal translation would make this sentence completely nonsensical.
Even when we all communicate in the same language, we do not always mean the same thing. Especially in literature and even more so in poetry, meaning is ascribed according to the context in which it is written or read. In other words, it is important to relate to the origin of the person whom we are trying to understand.
The same problem arises with dialects. Dialects are unique ways for communities to retain their culture whilst still being part of a much bigger environment. Dialects make people feel unique and are often regional and allow groups to retain their identity. Some communities use dialects to protect themselves from outsiders. Informal communication then becomes an important way of identifying any particular group of people. This creates social opportunities but also creates social problems when people are misunderstood and those from the community may misunderstand someone's improper use of their dialect or outsiders are left feeling hurt and mistrustful because they have misunderstood someone.
I'm not sure if you wanted this passage to be explained (as above) or corrected:
In some countries, different groups of people have their own unique dialects within a language. This is common in Arab communities in which some groups use a more formal dialect, while others do not. Although different groups can have their own unique way of informal communication, this can be a challenge for people outside of that social group. It can become difficult for an outsider to understand informal communication, unless it is explained clearly.