Complex sentence: In 1999 the company won the tender for the 1800 MHz frequency, in November, 2000 it started to operate on 1800 MHz in Budapest, in March, 2001 in the whole country.
Split into simpler sentences: In 1999 the company won a tender for the 1800 MHz frequency. In November, 2000 it started to operate on the 1800 MHz frequency in Budapest, and in March, 2001 in the whole country.