Complex sentence: This is a major departure from Hal previous fighter aircraft HAL Tejas which used in-house production with minor outsourcing, Amca uses modular method of production in order to reduce time for development and production.
Split into simpler sentences: This is a major departure from Hal's previous fighter aircraft, the HAL Tejas, which used in-house production with minor outsourcing. Additionally, AMCA uses a modular method of production in order to reduce the time required for development and production.