Complex sentence: Dreiškens started his career competing with pilot Jānis Miņins, but after Miņins retirement, he compete with Oskars Melbārdis, former brakeman who started competing as a pilot in 2010-11 season.
Split into simpler sentences: Dreiškens started his career competing with pilot Jānis Miņins. After Miņins retirement he compete with Oskars Melbārdis, former brakeman who started competing as a pilot in 2010-11 season.