Complex sentence: In 2002, KYSR began to experience a decreased market share noted in its declining ratings, which was also likely contributed to by a decrease in the amount of hit music product in the modern adult contemporary genre at the time.
Split into simpler sentences: In 2002, KYSR began to experience a decreased market share noted in its declining ratings. This is likely contributed by a decreased amount of hit music product in the modern adult contemporary genre at the time.