I do not want to bore you, but this work of the George Mason University, it is really valuable. They ask people who already manage to communicate in English, read a paragraph. Making a transcript of what they say, however, clarify: "Even though most speakers produce continuous speech, we arbitrarily leave spaces between each word for readability. We also add extra spaces to indicate pauses." And then they analyze it, detecting the places where they do not do it correctly, comparing it with the language they declare to speak.

Weinberger, Steven. (2014). Speech Accent Archive. George Mason University. Retrieved from http://accent.gmu.edu
"In order to say something about the phonetic transcriptions in this site, we have developed a series of phonological generalizations. Generalizations are general rules that describe a speaker's accent. Generalizations are made based on a comparison between the sample and our own dialect which happens to be General American English (GAE). We are not presuming to say that our accent is the only true English accent in comparison to which all others are deemed sub-standard or faulty. However, it would be impossible to make generalizations about our samples without some dialect to compare them to. Since we are American, we chose GAE, specifically English 1."
Frankenstein would surely be understood, but would not it be better to reduce and link?
This is how says the elicitation paragraph, and this is the trancription done by 2 to 4 English speaking judges who are phonetically educated
Let's analyze their reference:
Please call Stella
Does not say:
He says:  

Ask her to bring these things with her from the store
Does not say:
He says:
Does not say:
He says:
Does not say:
He says:

Six spoons of fresh snow peas
Does not say:
He says:
Does not say:
He says: in the best case.

five thick slabs of blue cheese
Does not say:
He says:
Does not say:
He says: in the best case.

and maybe a snack for her brother Bob
Does not say:
He says:
Does not say:
He says: in the best case.
Does not say:
He says: in the best case.

We also need a small plastic snake
Does not say:
He says:
Does not say:
He says: in the best case.

and a big toy frog for the kids
Does not say:
He says:
Does not say:
He says: in the best case.
Does not say:
He says: in the best case.

She can scoop these things into three red bags
Does not say:
He says:
Does not say:
He says: in the best case.
Does not say:
He says: where, except for your best opinion, you can not hear a big reduction.
Does not say:
He says: in the best case.

and we will go meet her Wednesday at the train station
Does not say:
He says:
Does not say:
He says: in the best case.
Does not say:
He says: in the best case.
Does not say:
He says: in the best case.