Complex sentence: In 2004, Lamar signed to Carson-based indie record label Top Dawg Entertainment (TDE) and in 2012, Lamar and the label signed a joint venture deal with Aftermath and Interscope Records.
Split into simpler sentences: In 2004, Lamar signed to Carson-based independent record label, Top Dawg Entertainment (TDE). Lamar secured a recording contract with a major-label in 2012, when TDE signed a joint venture deal with Aftermath and Interscope Records.