Complex sentence: Most of the meerschaum of commerce is obtained from Asia Minor, chiefly from the plain of Eskişehir in Turkey, between Istanbul and Ankara, where it occurs in irregular nodular masses, in alluvial deposits, which are extensively worked for its extraction.
Split into simpler sentences: Most of the meerschaum of commerce is obtained from Asia Minor, chiefly from the plain of Eskişehir in Turkey, between Istanbul and Ankara. It occurs there in irregular nodular masses, in alluvial deposits, which are extensively worked for its extraction.