1. Adjective word order:
Adjectives conventionally take the following order: opinion, dimension, age, shape, colour, origin, material, so we should say "exotic, imported, dark red, sports.
2. Passive voice:
Since we do not have an explicit subject, the verb should be in the passive voice ("was being driven").
4. Verb tense:
Since the activity occurred in the past and driving is an activity that extends through time, so the past progressive tense is probably best: "was being driven".
5. Word confusion:
"To" is a preposition. In this case, we want to use an intensifier: "too".
6. Word confusion:
Be careful not to confuse "of" and "off".
7. Verb tense:
"It'd skid" means "it had skid" (or "it would skid"). Since we want to say what happen at a particular moment in time ("when"), the simple past is probably best: "skidded".
8. Verb tense:
Again, since these events happened in the past, we should use the simple past tense: "was".
9. Word form/order:
“Serious” is an adjective. We want to describe the verb "injure" so we need an adverb: "seriously". Also note that the adverb is usually placed in front of the verb (not after it): "seriously injured".
Adjectives combined in a series should be separated by commas. Also note that "two young women" is an appositive, so it also needs to be separated with commas.
Possible solution:The exotic, imported, dark red, sports car was being driven too fast when it skidded off the road, and the passengers, two young women, were seriously injured.