Complex sentence: If history is known then it shows in the regime of Talpurs, Kalmati and Nizamani were assigned for the security of Karachi.On 2 February 1839, when two Britain Military Ships (Hina & Wales) boarded on Karachi Port (Manora).
Split into simpler sentences: If history is known then it shows in the regime of Talpurs, Kalmati and Nizamani were assigned for the security of Karachi. In 2 February 1839, when two Britain Military Ships (Hina & Wales) had arrived in Karachi Port (Manora).