Complex sentence: Ynglingatal is composed in "kviðuháttr" (modern Norwegian "kviduhått"); this genealogical verse form is also used in "Son loss" (Sonatorrek) in Egils saga.
Split into simpler sentences: Ynglingatal is composed in "kviðuháttr", modern Norwegian "kviduhått". This is the genealogical verse form, the same as is used, for example, in "Son loss" (Sonatorrek) in Egils saga.