Complex sentence: The Tethyan Himalayan sequence is composed of mainly siliciclastic and carbonate sedimentary rocks from 1840 Ma to 40 Ma which is inter-bedded with volcanic rocks of Paleozoic and Mesozoic.
Split into simpler sentences: The Tethyan Himalayan sequence is composed of mainly siliciclastic and carbonate sedimentary rocks from 1840 Ma to 40 Ma. These are inter-bedded with volcanic rocks of Paleozoic and Mesozoic.