Complex sentence: It was not till the end of May that the two English squadrons met with each other, and on 1 June, being then off Lisbon and capturing two Spanish prizes that word of a large carrack and eleven galleys were in the vicinity of Sesimbra Bay.
Split into simpler sentences: It was not till the end of May that the two English squadrons met with each other. On 1 June the English were off Lisbon with two captured Spanish prizes when word reached them that a large carrack and eleven galleys were in the vicinity of Sesimbra Bay.