This is the 16862nd most frequent Russian word.
совершал
"Совершал" means "committed," "performed," or "carried out" in English.
In this context, 'совершал' is used to describe a past habitual action or activity performed by the subject.
Он совершал длительные прогулки по лесу.
He made long walks through the forest.
Here, 'совершал' is utilized to convey the occurrence of actions (making mistakes) during the process of learning, emphasizing past events.
Она совершала ошибки, учась новому языку.
She made mistakes while learning a new language.
In this instance, 'совершал' illustrates an ongoing process or action (climbing) performed by the traveler in the past.