TASK DEFINITION: Given a disfluent sentence, modify the sentence to it to its equivalent fluent form, preserving the meaning of the sentence.
PROBLEM: At which or no rather what time did a river system develop in the Upper Rhine Graben?

SOLUTION: What time did a river system develop in the Upper Rhine Graben?

PROBLEM: Where, sorry, what was the seat of former party leader David McLetchie?

SOLUTION: What was the seat of former party leader David McLetchie?

PROBLEM: Along with Muslims, Jews and Protestant Christians, what category erm religious group notably operates private schools?

SOLUTION:
Along with Muslims, Jews and Protestant Christians, what religious group notably operates private schools?