Not as many people have been infected by corona as we initially had feared.
There are less people who are sick from corona than we thought.
ご質問ありがとうございます。
①
"Not as many people have been infected by corona"＝「コロナに感染した人たちはそれほど多くない」
"as we initially had feared."＝「私たちが最初に恐れていたように。」
②
"There are less people who are sick from corona"＝「コロナで病気になった人達は～よりも少ない」
"than we thought."＝「私たちが思っていたよりも。」
ご参考に！
アメリカ合衆国 
