Complex sentence: He was implicated in the attacks and received contact in its aftermath from Riduan Isamuddin (Hambali), who he provided a safe haven to and several of his close associates in his home in a quiet residential neighborhood of Karachi.
Split into simpler sentences: He was implicated in the attacks and was contacted in the aftermath by Riduan Isamuddin (Hambali). Al-Kuwaiti provided a safe haven to Isamuddin and several of his close associates in his home in a quiet residential neighborhood of Karachi.