You have lots of small sentences, and some of them lack the words to make it a complete one. For example, instead of starting a sentence with "Smart guy, ...",

You have lots of small sentences, and some of them lack the words to make it a complete one. For example, instead of starting a sentence with "Smart guy, ...", most people would write something like "He's a smart guy". Or instead of "An interesting conversation", people would write "We had many interesting conversations" or something along those lines.