וַתִּכְלֶ֕ינָה שֶׁ֖בַע שְׁנֵ֣י הַשָּׂבָ֑ע אֲשֶׁ֥ר הָיָ֖ה בְּאֶ֥רֶץ מִצְרָֽיִם׃
און עס האָבן זיך געענדיקט די זיבן יאָר פֿון דער זעט װאָס איז געװען אין לאַנד מִצרַיִם.
Chizkuni
ותכילנה, “they came to an end;” this unusual expression for describing the end of something is based on כלולות יופי, “they were completely beautiful, because fully sated.”
Da'at Zekenim
ותכילנה, “they came to an end;” according to B’reshit Rabbah, 90,6 the word is to be understood as derived from כלולות as in כלולותיך in Jeremiah 2,2, a reference to physical beauty, i.e. the seven years of plenty had resulted in the whole Egyptian population having a more pleasing and healthy appearance.
Radak
אשר היה, a collective term, hence in the singular היה instead of the plural היו.