Complex sentence: He was the founder of the agency, Omar's Men during the 80's and 90s, then worked with the agencies, Warning and Q. He is currently CEO and head-booker of the agency, Just Omar.
Split into simpler sentences: He was the founder of the agency, Omar's Men which was active during the 80's and early 90s. He then worked with the agencies, Warning and Q. He is currently CEO and head-booker of the agency, Just Omar.