Please explain the lexical analysis of the following grammar: b* a b* a (a+b)*

For example, this can generate the word: bbabbbabbaa since the first b* can be used to generate two b's followed, then an 'a', followed by three b's in the second b* followed by an 'a', then (a+b)* can be used to generated a 'b', 'b', 'a', and an 'a'.

Please explain in simple terms as this topic is confusing. What more can be said about the grammar?