Buffer a GeoDataFrame then break Multi-polygons to Polygons.

clean_gdf.py

import geopandas as gpd
import pandas as pd

def multipolygon_to_polygon(input_gdf):
    """Break each MultiPolygon to its constituting Polygons, create a new polygons DataFrame and then
       append it to the initial GeoDataFrame
    """
    gdf = input_gdf.copy()
    multipolygon_gdf = gdf.loc[lambda df: df.geometry.geom_type == 'MultiPolygon', :]
    for row_index, row in multipolygon_gdf.iterrows():
        polygons = [polygon for polygon in row['geometry']]  # Extract polygons from multipolygon
        data = row.to_dict()
        data['geometry'] = polygons
        polygons_df = pd.DataFrame(data, columns=list(row.index))
        gdf = gdf.drop(row_index)
        gdf = gdf.append(polygons_df)

    return gdf 
  
if __name__ == "__main__": 
    gdf.loc[lambda df: df.geometry == 'Polygon', 'geometry']=gdf.loc[
        lambda df: df.geometry == 'Polygon', 'geometry'].buffer(0)
    # Break each MultiPolygon to its constituting Polygons
    gdf = multipolygon_to_polygon(gdf)