Complex sentence: The autonomy software on rovers is becoming more advanced and for example with each pair of stereo images the Sojourner rover could generate 20 3D points while the MER rovers can generate 15,000 to 40,000 3D points.
Split into simpler sentences: The autonomy software on rovers is becoming more advanced. For example, with each pair of stereo images the Sojourner rover could generate 20 3D points while the MER rovers can generate 15,000 to 40,000 3D points.