Sale deed

I couldn't understand. Please Explain. That the SELLER and the PROMOTER and all persons having or lawfully of equitably claiming any right, title or interest at law or in equity in the Schedule ‘B’ Property hereby granted or any part thereof by, from under or in trust for them the SELLER and the PROMOTER or their heirs shall and from time to time and at all times hereafter at the request and cost of the PURCHASER/S do and execute or cause to be done and execute all such further and other lawful and reasonable acts deeds, things, conveyances, matters and assurance in law whatsoever for the better and more perfectly and absolutely granting unto and to the use of the PURCHASER/S in manner aforesaid shall or may be reasonably required by PURCHASER/S or heirs, administrators or assigns and the SELLER and the PROMOTER doth hereby covenants with the PURCHASER/S that it has not done, committed or knowingly or willingly suffered or been party or privy to any act, deed or thing whereby they are prevented from granting and conveying the Schedule ‘B’ Property in manner aforesaid or whereby the same or any part thereof are/is can or may be charged, encumbered or prejudicially affected in estates, title or otherwise howsoever.