That will give you the Laurent series that converges when |z|<2. In the region |z|>2 you need to write it as

.

In general, the Laurent series for

will consist of powers of

in the region |z|<a, and powers of

in the region |z|>a.

So for the function

there are three separate Laurent expansions, obtained by adding the power series expansions of the partial fractions. In the region |z|<1 you need to use positive powers of z/2 for the first fraction, and positive powers of z for the other two fractions. In the region 1<|z|<2 you need to use positive powers of z/2 for the first fraction, and negative powers of z for the other two fractions. In the region |z|>2 you need to use negative powers of z/2 for the first fraction, and negative powers of z for the other two fractions.