Complex sentence: A number of state-of-the-art technologies are worked into the telescope, e.g., 261 computer-controlled actuators press the main mirror from the back to correct its distortion when the telescope changes its orientation.
Split into simpler sentences: A number of state-of-the-art technologies were worked into the telescope. For example, 261 computer-controlled actuators press the main mirror from the back to correct its distortion when the telescope changes its orientation.