how to use 'turn' in the following context?

[bspkumar]

How to mix the following sentences using turn.
1.once he was a student
2.but now he became terrorist

is it correct to use in the following way?

>once ,he was a student but now he turned into a terrorist

wt i have to used 'turned out into a' or 'turned into a'

[2006]

How to mix the following sentences using turn.
1.once he was a student
2.but now he became terrorist

is it correct to use in the following way?

>once ,he was a student but now he turned into a terrorist

wt i have to used 'turned out into a' or 'turned into a'

You can 'simply' say, 'He is a student turned terrorist.' (use "is" because he still is a terrorist)
The above short sentence means, 'He was a student but he turned into a terrorist.'