Complex sentence: Lockheed-Martin realized that Yakovlev OKB already possessed extensive experience with VTOL systems, and funding further development of the Yak-141 would give Lockheed-Martin access to Yakovlev's designs.
Split into simpler sentences: Lockheed-Martin realized that Yakovlev OKB already possessed extensive experience with VTOL systems. Funding further development of the Yak-141 gave Lockheed-Martin access to Yakovlev's designs.