Complex sentence: In 1991, the second generation (2G) "digital" cellular technology was launched in Finland by Radiolinja on the GSM standard, which sparked competition in the sector, as the new operators challenged the incumbent 1G network operators.
Split into simpler sentences: In 1991, the second generation (2G) "digital" cellular technology was launched in Finland by Radiolinja on the GSM standard. This sparked competition in the sector as the new operators challenged the incumbent 1G network operators.