Quote:
A new influx of private investment should create a bright new future for manned space exploration, making the possibility of commercial space tourism a much more viable than it was 10 years ago.
When a modifying phrase modifies an action and not a noun, the first verb in the modifier changes to the <ing> form and 'which' is removed.
(
MGMAT SC BOOK, page 78)
Example.
The police found the murder weapon, which made the prosecutor's job much easier. -
(incorrect)
As in above sentence, when a modifier beings with 'which', it modifies the noun it touches; in this case 'murder weapon'.
To correct this problem, just change the verb starting the modifier to its <ing> form as done above; 'which made' changed to 'making'.
The police found the murder weapon, making the prosecutor's job much easier. -
(Correct)
This makes it clear that the modifier is modifying the action of finding the murder weapon.
Does this clear it up for you?