Complex sentence: Co-location also enabled SES to make more efficient use of its available bandwidth and to expand services more rapidly and was crucial to its growth in the 1990s, which witnessed the rapid expansion of the Direct-to-Home market.
Split into simpler sentences: Co-location also enabled SES to make more efficient use of its available bandwidth and to expand services more rapidly. This was crucial during the 1990s which witnessed the rapid expansion of the Direct-to-Home market.