If you have never heard of FANBOYS and i don't mean the film i mean the acronym this might be a useful breakdown and tool for you.
In English we typically form a sentence using the subject + verb then the object if there is one S+V+O this makes a short sentence
This is a simple phrase with an idea and many beginners can do this. In order to link 2 ideas we can use a certain set of conjunctives ... there are many conjunctives which can make one idea longer or more detailed but only a few which can link 2 ideas that are related.
They are called coordinating conjunctions and they can be remembered using the mnemonic FANBOYS