Complex sentence: Béjar collaborated with Velasco's Government being part of SINAMOS, a Government institution for social participation, where he worked with youth, rural, cooperative and popular movements, supporting the national land reform.
Split into simpler sentences: Béjar collaborated with Velasco's Government being part of SINAMOS, a Government institution for social participation. From SINAMOS, he worked with youth, rural, cooperative and popular movements, supporting the national land reform.