Answer:
Hello. Since you have presented many sentences, I combined each pair using a relative clause. The result was:
- Blindness still scares people in the 21st century which causes terror and despair around the world.
- The perceptual mobility approach is meant for blind people, who were successful in using it.
- Juan Ruiz is one of the users of the approach, who says he was taught to see with his ears.
- Kish uses a panel to make an experiment on stage, which is moved towards the face with sonar.
Step-by-step explanation:
To connect two sentences using a relative clause, you just need to change the subjects of the sentences to relative pronouns, or add relative pronouns to the sentence and then manipulate the rest of the words to make them consistent with that pronoun. The relative pronouns are: what, which, who, whose, when, how much, how many, how and where.