A conduct complaint is defined in section 250.18, and an interference complaint is defined in section 250.19.
Basically, a conduct complaint is any person, including an officer and non-commissioned member, making a complaint about the conduct of a member of the military police in the performance of any of the policing duties and functions that are prescribed.
An interference complaint would be a member of the military police who conducts or supervises a military police investigation or who has done so and believes, on reasonable grounds, that any officer or member of the department has improperly interfered. He can then make an interference complaint.
For those two sets of circumstances of two types of complaints, there's a scheme that says what we should do with this in part IV.