The outer conditional contains two branches. The first branch contains a simple statement.
The second branch contains another if statement, which has two branches of its own.
Those two branches are both simple statements, although they could have been conditional
statements as well.
Although the indentation of the statements makes the structure apparent, nested conditionals
become difficult to read very quickly. It is a good idea to avoid them when you
can.
Logical operators often provide a way to simplify nested conditional statements. For example,
we can rewrite the following code using a single conditional: