[Python] How can I explode the string in sublists and fill into individual sublist

I have a list like this.

[["Hi, this is Tesa form the sales departmet. Iam working here from"],[""],[""]]


How can I explode this string inside the first sublist by preserving words by filling all sublists.Like,

[["Hi, this is Tesa."],["form the sales departmet"],["Iam working here from"]]


Things to consider:

1. The number of sublists will can be n but all of them will be empty for sure except the first one.
2. Word format should not be broken. There is no need to preserve the sentence meaning.

what I have:

def explode_string(array, split_positions=None):
original_text = array[0][0]
num_sublists = len(array)

if split_positions is None:
chunk_size = len(original_text) // num_sublists
split_positions = [chunk_size * i for i in range(1, num_sublists)]

parts = []
start = 0
for pos in split_positions:
parts.append(original_text[startos])
start = pos
parts.append(original_text[start:])

result = [[part] for part in parts]

return result

original_array = [
["Hi, this is Tesa form the sales departmet. Iam working here from"],
[""],
[""]
]

result = explode_string(original_array, [15, 39])
print(result)


The output iam getting:

[['Hi, this is Tes'], ['a form the sales departm'], ['et. Iam working here from']]


The dataset is very long, Looking if you guys suggest any easy approch to tackle this.

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