Complex sentence: The phone shared the same platform as the Nokia 5110 targeted at the consumer market; unlike the 5110, however, it had the advanced user interface of the 2110 and featured an infra-red port.
Split into simpler sentences: The phone shared the same platform as the Nokia 5110 targeted at the consumer market. Unlike the 5110 it had the advanced user interface of the 2110 and featured an infra-red port.