When importing paths as SVGs different paths are imported as different curves.
To make different curves into a single one: In Object Mode Select the curves (use the Shift key to select multiple objects)
Then press CtrlJ to Join
From The Blender Manual**.
Join merges all selected objects into the last selected Active object. All object data is linked to the active object (which must be selected). All objects must be of the same type: mesh, curve, surface or armature. If several curves are joined, each one will keep its subtype (NURBS or Bézier).
CtrlAltShiftCthen choose "Mesh from curve" – David Oct 08 '17 at 12:03