To make this shorter, you can do the following:

```python
samples = np.vstack([multivariate_normal([10, 10], [[3, 5],[4, 2]], 100000),
                     multivariate_normal([30, 20], [[2, 3],[1, 3]], 1000)
                    ])
```

Or call your variable `data` instead of `samples`. Or make the imported name shorter

```python
from numpy.random import multivariate_normal as mv_normal
```