split a long text into small chunks, it won't cut your words.

split.py

def split_message(text, length=4096, offset=200):
    return [text[text.find('\n', i - offset, i + 1) if text.find('\n', i - offset, i + 1) != -1 else i:
                 text.find('\n', i + length - offset, i + length) if text.find('\n', i + length - offset,
                                                                               i + length) != -1 else i + length] for
            i
            in
            range(0, len(text), length)]


# Usage, Using Pyrogram
text = 'some really long text'
for m in split_message(text):
    app.send_message('me', m)