The phrase "also noticed that many" is correct and usable in written English.
It can be used when you want to indicate that you have observed a particular trend or behavior among a group of people or things.
Example: "In my research, I also noticed that many participants preferred the new software over the old version."
Alternatives: "also observed that numerous" or "additionally saw that many".
He also noticed that many women seemed to have a way with people and the management skills to do well at sales.
He also noticed that many films involved what he called defiance: ordinary Americans standing up to foreign tyranny or more often domestic bullies.
Ms. Pollack said Time editors also noticed that many of the photographers they worked with were expanding into video journalism, giving them a familiar pool of expert video journalists to work with on the new projects.
He also noticed that many photographers he recognized were coming to see the show, and he began asking each of them to describe which of Frank's photographs was their favorite.
I also noticed that many of the other skills – coordination, social perceptiveness, judgement and decision making, complex problem-solving, active learning, and negotiation – aren't necessarily learned through the traditional academic curriculum of math, science, English language arts, and social studies that schools offer.
We also noticed that many of the more expensive entries on the list benefited from a lack of competition.
You will also notice that many entries begin with words such as, "The jury presents…" This "jury," anywhere from ten to twenty-four men selected from the attendees of the court, both presented and decided the cases.
It is also noticed that in many cases, effects of the control voltage on the results may be ignored compared to the temperature-dependency of the material properties and initial geometric imperfections effects.
We also noticed that in many of the cases, the topics found were related to different molecular aspects of the studies for the disease.
At the same time, we also noticed that there were many visible peaks in the fragment spectra, but their structures could not be confirmed.
Desai also noticed that there were too many characters in the book, most of them remaining unexplored.
