The word "there" refers to the house that Jesus stayed it in Capernaum. Alternate translation: "So many people gathered there" or "So many people came to the house" (See: [[rc://en/ta/man/translate/figs-explicit]])
This refers to there being no space inside the house. Alternate translation: "there was no more room for them inside" (See: [[rc://en/ta/man/translate/figs-explicit]])