Here is some information from John Langan and Janet M. Goldstein’s English Brushup, 5th edition
Chapter 23 English Brushup- Mixed Constructions
These are sentences whose parts do not logically fit together
To correct one, try the following:
1. Turn the first part of the sentence into something that can be the subject
Mixed: By practicing six hours a day helped Sasha become a champion skater.
Corrected: Practicing six hours a day helped Sasha become a champion skater.
2. Turn the second part of the sentence into a complete statement.
Mixed: Just because you got your learner’s permit does not automatically give you permission to drive the car.
Corrected: Just because you got your learner’s permit, you do not automatically get permission to drive the car.
There are 3 word groups that lead to mixed constructions:
-IS (along with other forms of to be) is a linking verb so it needs to be followed by a subject complement (a noun), and not a dependent word like where, when, or because. It’s really just best to avoid using is when oris where altogether in definitions or when giving examples
Mixed: An approach-avoidance conflict is when someone is both attractedto and repelled by the same goal.
Corrected: An approach-avoidance conflict is a situation in which (or occurs when) someone is both attracted to and repelled by the same goal.
-reason is because
-To correct reason is because, eliminate reason or because
Mixed: The reason Tanya was promoted is because she is a hard worker.
Corrected: Tanya was promoted because she is a hard worker.
This must be a bear for ELLs as I know it is tough for many a native English speakers. I use mixed constructions often and probably will continue to do so if not paying attention when speaking.