τοῦτο δὲ ἔλεγε σημαίνων ποίῳ θανάτῳ ἤμελλεν ἀποθνήσκειν.

1. τοῦτο
   this
2. δὲ
   but
   and
3. ἔλεγε
   he said
   he was saying, said
4. σημαίνων
   signifying
5. ποίῳ
   by what
   by what kind of, what kind of
6. θανάτῳ
   death
   by death
7. ἤμελλεν
   he was about to
   he was about, was about
8. ἀποθνήσκειν
   to die
9.  
   .
    

He was saying this to signify by what death he was about to die.