There were around forty people on the company's payroll, but they were all trying to obtain information on each other.
こんにちは。
ご質問ありがとうございます。
"There were around forty people on the company's payroll,"=「会社の従業員は40人ほどいた。」
"but they were all trying to obtain information on each other."=「だが、彼ら全員、互いの情報を手に入れようとしていた。」
ご参考になると幸いです。