But that's not "two scripts put together." That's two authors dividing the labor on a single script. If you'd just left out that first sentence, you would've been fine.
Or, as it usually called, "a collaboration."
And that's not at all an unusual way to write something together. Just the other day, I was reading an interview with a two-man team of TV writers, who explained that, rather than write every scene together, they tend to split the plot between themselves and edit each other's scenes.
Closer to home, I've collaborated on at least two novels that way. For example, when John Betancourt and I wrote a Deep Space Nine
book together, we divided the plot and characters between us. He wrote all the Away Team scenes (with Kira and Bashir and Dax) and I wrote all the scenes on the space station (with Odo and Sisko and the rest). Then we tied everything up by writing the final chapter together.
Sometimes it's just the most efficient and time-effective way to get a project done on time.