splitJson.py

import os
import json
#you need to add you path here
with open(os.path.join('C:/Users/vanev/Dropbox/PC/Documents/Respaldos Proyectos/Develop/AAT Getty/', 'data.json'), 'r',
          encoding='utf-8') as f1:
    lla = [json.loads(line.strip()) for line in f1.readlines()]

#
    #this is the total length size of the json file
    print(len(lla))
for lle in lla[0].values():
    ll = lle['Subject']
    #in here 2000 means we getting splits of 2000 tweets
    #you can define your own size of split according to your need
    size_of_the_split=2000
    total = len(ll) // size_of_the_split

    #in here you will get the Number of splits
    print(total+1)

    for i in range(total+1):
        json.dump(ll[i * size_of_the_split:(i + 1) * size_of_the_split], open(
            "C:/Users/vanev/Dropbox/PC/Documents/Respaldos Proyectos/Develop/AAT Getty/" + str(i+1) + ".json", 'w',
            encoding='utf8'), ensure_ascii=False, indent=True)