Complex sentence: The initial specified clock frequency limit was 2 MHz and with common instructions using 4,5,7,10, or 11 cycles this meant that it operated at a typical speed of a few hundred thousand instructions per second.
Split into simpler sentences: The initial specified clock frequency limit was 2 MHz, and with common instructions having execution times of 4,5,7,10, or 11 cycles. This meant that it operated at an effective speed of a few hundred thousand instructions per second.