People who began working at the same time I did have started to quit their jobs.
It seems like a lot of people with the same seniority as me have begun to quit work one right after another.
ーPeople who began working at the same time I did have started to quit their jobs.
「私の同期が仕事を辞めていく」
people who began working at the same time I did で「私と同じ時に仕事を始めた人たち」＝「私の同期」
to start to quit their job で「仕事を辞め始める」
ーIt seems like a lot of people with the same seniority as me have begun to quit work one right after another.
「私のたくさんの同期が次々に仕事を辞めていくようだ」
people with the same seniority as me で「私と同じ勤務年数の人たち」＝「私の同期」
one right after another で「次々と」
ご参考まで！
カナダ 
