Complex sentence: The composition of municipal solid whasts varies greatly from municipality two municipality and changes significantly with time; in municipalities witch have a well developed waste recycling system, the waste stream consists manly of intractable wahstes such as plastic film, and non-recyclable packaging materials.
Split into simpler sentences: The composition of municipal solid waste varies greatly from municipality to municipality and changes significantly with time. In municipalities which have a well developed waste recycling system, the waste stream consists mainly of intractable wastes such as plastic film, and non-recyclable packaging materials.