Complex sentence: His book "An Introduction to Database Systems", currently in its 8th edition, is widely regarded as the standard text on the subject; it has sold well over 700,000 copies not counting translations and is used by several hundred colleges and universities worldwide.
Split into simpler sentences: His book "An Introduction to Database Systems", currently in its 8th edition, is widely regarded as the fundamental text on the subject. It has sold well over 700,000 copies not counting translations and is used by several hundred colleges and universities worldwide.