Complex sentence: The biggest reported shift is for teachers recommending use of Wikipedia for initial data gathering (from 40% to 55%), similarly the number of those telling students to never use Wikipedia decreased from 52% to 31%.
Split into simpler sentences: The biggest reported shift is for teachers recommending use of Wikipedia for initial data gathering (from 40% to 55%). Similarly, the number of those telling students to never use Wikipedia decreased from 52% to 31%.