Любой квалифицированный специалист

Любой квалифицированный специалист мог с легкостью поймать его на ошибке, а его вычисления по любой теме всегда приходилось проверять дважды

Результаты (английский) 1:

Any qualified specialist can easily catch it on an error, and his calculations on any subject always had to check twice

Результаты (английский) 2:

Any qualified person can easily catch him in error, and its computation on any topic always had to check twice

Результаты (английский) 3:

any qualified person could easily catch on his mistake, and his calculations on any topic always had to twice