Let $G$ be a finite group. If $G= G_1\times G_2 \cdots G_t$ and $G = H_1 \times H_2 \cdots H_t$ with each $G_j,H_j$ indecomposable , then $s=t$ and after reindexing $G_i \cong H_i$ for every $i$ and for each $r \le t$
$G = G_1 \times G_2 \cdots G_r \times H_{r+1}\times \cdots H_t$
Notice that the uniqueness statement is stronger than simply saying that the indecomposable factors are determined upto isomorphism.
Question 1 : I am not getting the meaning of bold text.
Question 2 : Why condition that each factor has to be $G_i$ indecomposable?