The phrase "allowed him to monitor" is correct and usable in written English.
It can be used when discussing permission granted to someone to observe or keep track of something.
Example: "The new software update allowed him to monitor the system's performance in real-time."
Alternatives: "permitted him to oversee" or "enabled him to track".
At one point, Proust subscribed to a rudimentary broadcast service that allowed him to monitor performances from Paris opera houses and concert halls over a telephone line.
And during his recently completed stint as a visiting scholar in American universities, the Internet allowed him to monitor the discourse back home in China.
Special phone lines in his Bel Air home allowed him to monitor his client stations by punching in a code and listening.
Mr. Sullivan, who was called numerous times to testify before Congress, defended the covert bombings and insisted that his knowledge of Laos allowed him to monitor them closely and to minimize civilian casualties.
It was a gift that allowed him to monitor and lift his own team at critical moments and to destroy opposing teams when he sensed their special moment of vulnerability.
Rhodes' trip to Australia also allowed him to monitor the progress of two of Worcestershire's younger players who have headed there over the first half of the winter.
His rare concession to modernity is the bank of 33 television sets in his office, which allow him to monitor all available satellite channels at once.
A steel pin at the edge of the manuscript is actually a computerized sensor, allowing him to monitor Magna Carta from his home, near Oxford.
Such is Mr. Cameron's devotion that he ordered the creation of an iPad app that would allow him to monitor the British economy.
My iPad allows him to monitor all the teams' disabled list, with which he has developed a rather disturbing fascination, and he adores modern ballparks' center-field kiddie games that traditionalists loathe.
This allows him to monitor not only financial information like operating margins and cash balances but also detailed quality data on individual doctors like 30-day hospital readmission rates and the number of infections associated with invasive procedures.
