A few lines to make your_off-facebook_activity.json easier to read

off-facebook-activity.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

# requirements: pandas, xlrd

import pandas as pd
import json

with open('your_off-facebook_activity.json', encoding='utf-8') as f:
    data = json.load(f)

# unnest data
rows = []
for provider in data['off_facebook_activity']:
    for item in provider['events']:
        item['name'] = provider['name']
        rows.append(item)

# Unix timestamp to date and time
df = pd.DataFrame(rows)
df['date'] = pd.to_datetime(df['timestamp'], unit='s')

# Save to Excel using xlrd
df[['name', 'type', 'date', 'timestamp', 'id']].to_excel('events.xlsx', index=False)