import numpy as np
arr = np.array([[1, 2], [3, 4], [5, 6], [7, 8], [9, 10], [11, 12]])
newarr = np.array_split(arr, 3)
print(newarr)
[array([[1, 2], [3, 4]]), array([[5, 6], [7, 8]]), array([[ 9, 10], [11, 12]])]