Zbrush Export as OBJ too many Groups?

After exporting from zbrush…
Why in maya are there so many groups?

I cant go from Object mode to Vertex mode in peace
because I have to right click and make it vertex mode for every single group….

2 pieces of the “groups”

http://img.techpowerup.org/161216/2016-12-16-15h54-15.png

“Groups” in Outliner

http://img.techpowerup.org/161216/2016-12-16-15h54-05.png