How to call the on_modified function in watchdog and make the while loop work for both true and false?

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Python

import os
import time
from watchdog.observers import Observer
from watchdog.events import FileSystemEventHandler

original = []
class MyHandler(FileSystemEventHandler):
    def on_modified(self, event):
        global original
        originalFile = event.src_path.split('/')[-1]
        original.append(originalFile)
        if Path(event.src_path).parent.samefile(fullPath):
            return True
        return False

    while True:
        if on_modified:
            global original
            print(original)
            print("Main path is modified")
            break

    while False:
        if on_modified:
            global original
            print(original)
            print("Sub path is modified")
            break

def monitorFolders(path):
    event_handler = MyHandler()
    observer = Observer()
    observer.schedule(event_handler, path, recursive=True)
    observer.start()

    try:
        while True:
            time.sleep(1)
    except KeyboardInterrupt:
        observer.stop()
    observer.join()

fullPath = "/home/bilal/Documents/Projects/BMP/Monitor/folder1/"

if __name__ == "__main__":
    m1 = monitorFolders(fullPath)
    m1.start()
    m1.join()

What I have tried:

In this code, I am facing two problems.

The first problem is that t gives me the message multiple times. I want to show the message just once. That's why I used a while loop with a break. The while loop works for True but I want to make the while loop work for both True and False.

The second problem is that I am using on_modified inside the while loop but I don't know how to call this function to make it work properly.