Complex sentence: The most notable seminar was at Rickey's Hyatt House in Palo Alto, California in early June 1975, where a member of the Homebrew Computer Club left with an un-released copy of Altair BASIC.
Split into simpler sentences: The most notable seminar was at Rickey's Hyatt House in Palo Alto, California in early June 1975. A member of the Homebrew Computer Club left with an un-released copy of Altair BASIC.