2.Teenagers/decisions/concerning/theirlives/participate in/will/important/./

⇒Teenagers will participate in important decisions concerning their lives.
3. In spite of/poor health/her/works/twelve/a day/hours/she/./

⇒ In spite of her poor health, she works twelve hours a day .
4. My grandfather,/ten years./has been/for/retired/who/an astronaut, /be/used to/

⇒ My grandfather, who used to be an astronaut, has been retired for ten years now. 
 5. Nowadays,/there/varieties of/all over the world/English/are/such as/and /British English/AmericanEnglish/Indian English.

⇒ Nowadays, there are many varieties of English all over the world such as British English, Australia English, American English, Indian English.