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Why is this an issue?
Nested code - blocks of code inside blocks of code - is eventually necessary, but increases complexity. This is why keeping the code as flat as
possible, by avoiding unnecessary nesting, is considered a good practice.
Merging if statements when possible will decrease the nesting of the code and improve its readability.
if (condition1) {
  if (condition2) {             // Noncompliant
    /* ... */
  }
}

Will be more readable as
if (condition1 && condition2) { // Compliant
  /* ... */
}

How to fix it
If merging the conditions seems to result in a more complex code, extracting the condition or part of it in a named function or variable is a
better approach to fix readability.
Code examples
Noncompliant code example
if (file != null) {
  if (file.isFile || file.isDirectory) {       // Noncompliant
    /* ... */
  }
}

Compliant solution
if (file != null && isFileOrDirectory(file)) { // Compliant
  /* ... */
}

def isFileOrDirectory(file: File): Boolean = file.isFile || file.isDirectory