It’s hard to describe this problem, but the code below should clarify.
Basically i start with an array where first element is another array of N size.
the rest of the array is a single element. I want to split the first element a for every partion, fill with the remainder of the array:

import pandas as pd, numpy as np

data = [['100',    '200',      '300',   '400'],
        'val1',
        'val2',
        ]

ids = np.array_split(data[0], 2)
new_array = []
for id in ids:
        data[0] = id
        new_array.append(data[:])

new_array

So i end up with this:

[[['100', '200'], 'val1', 'val2'], 
 [['300', '400'], 'val1', 'val2']]

is this the best way of doing this that will also be fast for very large arrays?