GMAT Sentence Correction (SC) | VeritasPrep CAT Qn

I dont know if I can post a VeritasPrep SC, but can someone explain this answer?

After increasing steadily from 1995 to 2000, the percentage of students in urban middle schoolssuffering from diabetes or being at least 30 pounds overweight decreased the following two years, down to 42.0 percent in 2002 from 43.4 percent in 2001 and 44.7 percent in 2000.

A suffering from diabetes or being at least 30 pounds overweightdecreased the following two years,down to 42.0 percent in 2002 from 43.4