I suspect that they are restricting the number of tests in order to make it look as though the number of infected people is not so high.
ご質問ありがとうございます。
"I suspect that"=「私は~と疑っている」
"they are restricting the number of tests"=「彼らは検査数を制限していると」
"in order to make it look as though"=「~のように見せかけるために」
"the number of infected people is not so high."=「感染者数がそれほど多くないように。」
ご参考に。