Bad:

Package: foo-unified
Version: 1.0
Revision: 1
Depends: %N-shlibs (= %v-%r)
SplitOff: <<
  Package: %N-shlibs
<<
SplitOff2: <<
  Package: foo-ssl-shlibs
  Depends: %N-shlibs (= %v-%r)
<<
SplitOff3: <<
  Package: foo-ssl
  Depends: %N (= %v-%r), foo-ssl-shlibs (= %v-%r)
<<

Good:

Package: foo-unified
Version: 1.0
Revision: 1
Depends: %N-shlibs (= %v-%r)
SplitOff: <<
  Package: %N-shlibs
<<
SplitOff2: <<
  Package: foo-ssl-shlibs
  Depends: %N-shlibs (= %v-%r)
<<
SplitOff3: <<
  Package: foo-ssl
  Depends: %N (= %v-%r)
<<

Bad:

Package: foo-unified
Version: 1.0
Revision: 1
Depends: %N-shlibs (= %v-%r)
Conflicts: foo-ssl (<< %v-%r), foo (<< %v-%r)
Replaces: foo-ssl, foo
SplitOff: <<
  Package: %N-shlibs
  Conflicts: foo-ssl-shlibs (<< %v-%r), foo-shlibs (<< %v-%r)
  Replaces: foo-ssl-shlibs, foo-shlibs
<<
SplitOff2: <<
  Package: foo-ssl-shlibs
  Depends: %N-shlibs (= %v-%r)
<<
SplitOff3: <<
  Package: foo-ssl
  Depends: %N (= %v-%r), foo-ssl-shlibs (= %v-%r)
<<

Good:

Package: foo-unified
Version: 1.0
Revision: 1
Depends: %N-shlibs (= %v-%r)
Conflicts: foo-ssl (<< %v-%r), foo (<< %v-%r)
Replaces: foo-ssl, foo
SplitOff: <<
  Package: %N-shlibs
  Conflicts: foo-ssl-shlibs (<< %v-%r), foo-shlibs (<< %v-%r)
  Replaces: foo-ssl-shlibs, foo-shlibs
<<
SplitOff2: <<
  Package: foo-ssl-shlibs
  Depends: %N-shlibs (= %v-%r)
<<
SplitOff3: <<
  Package: foo-ssl
  Depends: %N (= %v-%r)
<<