Complex sentence: The metotic strut of "Troodon" was enlarged from side-to-side, similar to "Dromaeosaurus" and primitive birds like "Archaeopteryx" and "Hesperornis".
Split into simpler sentences: The metotic strut of "Troodon" was "laterally hypertrophied". This condition resembles that of "Dromaeosaurus" and primitive birds like "Archaeopteryx" and "Hesperornis".