Complex sentence: Ramírez began his career in the reserve side of Atletico Marte before joining the main squad in 2011, during his four years there he played 98 games and scored 29 goals, becoming their highest goalscorer in the apertura/clausura format for the team.
Split into simpler sentences: Ramírez began his career in the reserve side of Atletico Marte before joining the main squad in 2011. During his four years there he played 98 games and scored 29 goals, becoming their highest goalscorer in the apertura/clausura format for the team.